diff --git a/Cargo.lock b/Cargo.lock
index e18b29f..9044ac3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1675,7 +1675,7 @@ checksum = "e4a24736216ec316047a1fc4252e27dabb04218aa4a3f37c6e7ddbf1f9782b54"
 [[package]]
 name = "nix-data"
 version = "0.0.2"
-source = "git+https://github.com/snowflakelinux/nix-data#a75a234c2ffa661b6d3f6d276dc372677e5e2c74"
+source = "git+https://github.com/snowflakelinux/nix-data#42d0e42536627cdce50c522f161617b797f670be"
 dependencies = [
  "anyhow",
  "brotli",
@@ -2461,18 +2461,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.147"
+version = "1.0.148"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d193d69bae983fc11a79df82342761dfbf28a99fc8d203dca4c3c1b590948965"
+checksum = "e53f64bb4ba0191d6d0676e1b141ca55047d83b74f5607e6d8eb88126c52c2dc"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.147"
+version = "1.0.148"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f1d362ca8fc9c3e3a7484440752472d68a6caa98f1ab81d99b5dfe517cec852"
+checksum = "a55492425aa53521babf6137309e7d34c20bbfbbfcfe2c7f3a047fd1f6b92c0c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2797,9 +2797,9 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.103"
+version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
+checksum = "4ae548ec36cf198c0ef7710d3c230987c2d6d7bd98ad6edc0274462724c585ce"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/default.nix b/default.nix
index 286a8ac..2063838 100644
--- a/default.nix
+++ b/default.nix
@@ -20,7 +20,7 @@ pkgs.stdenv.mkDerivation rec {
   cargoDeps = pkgs.rustPlatform.fetchCargoTarball {
     inherit src;
     name = "${pname}-${version}";
-    hash = "sha256-QaAWND3AF+/Bg38J0yzYzbU6FtIiBpLL21oKMa5RYwU=";
+    hash = "sha256-OmHjQkK1MGes9hbJ0LEGdP1wA8ohAJEon0ycoNppl0E=";
   };
 
   nativeBuildInputs = with pkgs; [
diff --git a/nsc-helper/src/main.rs b/nsc-helper/src/main.rs
index 065d7fa..7f55491 100644
--- a/nsc-helper/src/main.rs
+++ b/nsc-helper/src/main.rs
@@ -12,12 +12,18 @@ enum SubCommands {
         /// Write stdin to file in path output
         #[arg(short, long)]
         output: String,
+        /// How many generations to keep
+        #[arg(short, long)]
+        generations: Option<u32>,
         /// Run `nixos-rebuild` with the given arguments
         arguments: Vec<String>,
     },
     Rebuild {
         /// Run `nixos-rebuild` with the given arguments
         arguments: Vec<String>,
+        /// How many generations to keep
+        #[arg(short, long)]
+        generations: Option<u32>,
     },
     Channel {
         /// Whether to rebuild the system after updating channels
@@ -29,6 +35,9 @@ enum SubCommands {
         /// Write stdin to file in path output
         #[arg(short, long)]
         output: String,
+        /// How many generations to keep
+        #[arg(short, long)]
+        generations: Option<u32>,
         /// Run `nixos-rebuild` with the given arguments
         arguments: Vec<String>,
     },
@@ -45,6 +54,9 @@ enum SubCommands {
         /// Write stdin to file in path output
         #[arg(short, long)]
         output: String,
+        /// How many generations to keep
+        #[arg(short, long)]
+        generations: Option<u32>,
         /// Run `nixos-rebuild` with the given arguments
         arguments: Vec<String>,
     },
@@ -65,10 +77,14 @@ fn main() {
     }
 
     match derived_subcommands {
-        SubCommands::Config { output, arguments } => {
+        SubCommands::Config {
+            output,
+            generations,
+            arguments,
+        } => {
             let old = fs::read_to_string(&output);
             match write_file(&output) {
-                Ok(_) => match rebuild(arguments) {
+                Ok(_) => match rebuild(arguments, generations) {
                     Ok(_) => {}
                     Err(err) => {
                         eprintln!("{}", err);
@@ -86,7 +102,10 @@ fn main() {
                 }
             };
         }
-        SubCommands::Rebuild { arguments } => match rebuild(arguments) {
+        SubCommands::Rebuild {
+            generations,
+            arguments,
+        } => match rebuild(arguments, generations) {
             Ok(_) => (),
             Err(err) => {
                 eprintln!("{}", err);
@@ -97,6 +116,7 @@ fn main() {
             rebuild: dorebuild,
             update,
             output,
+            generations,
             arguments,
         } => {
             if update {
@@ -108,7 +128,7 @@ fn main() {
             match channel() {
                 Ok(_) => {
                     if dorebuild {
-                        match rebuild(arguments) {
+                        match rebuild(arguments, generations) {
                             Ok(_) => (),
                             Err(err) => {
                                 eprintln!("{}", err);
@@ -128,6 +148,7 @@ fn main() {
             flakepath,
             update,
             output,
+            generations,
             arguments,
         } => {
             if update {
@@ -139,7 +160,7 @@ fn main() {
             match flake(&flakepath) {
                 Ok(_) => {
                     if dorebuild {
-                        match rebuild(arguments) {
+                        match rebuild(arguments, generations) {
                             Ok(_) => (),
                             Err(err) => {
                                 eprintln!("{}", err);
@@ -166,18 +187,38 @@ fn write_file(path: &str) -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-fn rebuild(args: Vec<String>) -> Result<(), Box<dyn Error>> {
+fn rebuild(args: Vec<String>, generations: Option<u32>) -> Result<(), Box<dyn Error>> {
     let mut cmd = Command::new("nixos-rebuild").args(args).spawn()?;
     let x = cmd.wait()?;
-    if x.success() {
-        Ok(())
-    } else {
+    if !x.success() {
         eprintln!("nixos-rebuild failed with exit code {}", x.code().unwrap());
-        Err(Box::new(io::Error::new(
+        return Err(Box::new(io::Error::new(
             io::ErrorKind::Other,
             "nixos-rebuild failed",
-        )))
+        )));
     }
+    if let Some(g) = generations {
+        if g > 0 {
+            let mut cmd = Command::new("nix-env")
+                .arg("--delete-generations")
+                .arg("-p")
+                .arg("/nix/var/nix/profiles/system")
+                .arg(&format!("+{}", g))
+                .spawn()?;
+            let x = cmd.wait()?;
+            if !x.success() {
+                eprintln!(
+                    "nix-env --delete-generations failed with exit code {}",
+                    x.code().unwrap()
+                );
+                return Err(Box::new(io::Error::new(
+                    io::ErrorKind::Other,
+                    "nix-env failed",
+                )));
+            }
+        }
+    }
+    Ok(())
 }
 
 fn channel() -> Result<(), Box<dyn Error>> {
diff --git a/src/ui/installedpage.rs b/src/ui/installedpage.rs
index 84fd1c9..4b9005b 100644
--- a/src/ui/installedpage.rs
+++ b/src/ui/installedpage.rs
@@ -228,7 +228,6 @@ impl FactoryComponent for InstalledItemModel {
     type Init = InstalledItem;
     type Input = InstalledItemInputMsg;
     type Output = InstalledItemMsg;
-    type Widgets = InstalledItemWidgets;
     type ParentWidget = adw::gtk::ListBox;
     type ParentInput = InstalledPageMsg;
 
diff --git a/src/ui/installworker.rs b/src/ui/installworker.rs
index 6402c92..8726d92 100644
--- a/src/ui/installworker.rs
+++ b/src/ui/installworker.rs
@@ -16,8 +16,7 @@ pub struct InstallAsyncHandler {
     #[tracker::no_eq]
     process: Option<JoinHandle<()>>,
     work: Option<WorkPkg>,
-    systemconfig: Option<String>,
-    flakeargs: Option<String>,
+    config: NixDataConfig,
     pid: Option<u32>,
     syspkgs: SystemPkgs,
     userpkgs: UserPkgs,
@@ -47,8 +46,12 @@ impl Worker for InstallAsyncHandler {
         Self {
             process: None,
             work: None,
-            systemconfig: None,
-            flakeargs: None,
+            config: NixDataConfig {
+                systemconfig: None,
+                flake: None,
+                flakearg: None,
+                generations: None
+            },
             pid: None,
             syspkgs: params.syspkgs,
             userpkgs: params.userpkgs,
@@ -60,16 +63,7 @@ impl Worker for InstallAsyncHandler {
         self.reset();
         match msg {
             InstallAsyncHandlerMsg::SetConfig(config) => {
-                self.systemconfig = config.systemconfig;
-                self.flakeargs = if let Some(flake) = config.flake {
-                    if let Some(flakearg) = config.flakearg {
-                        Some(format!("{}#{}", flake, flakearg))
-                    } else {
-                        Some(flake)
-                    }
-                } else {
-                    None
-                }
+                self.config = config;
             }
             InstallAsyncHandlerMsg::SetPkgTypes(syspkgs, userpkgs) => {
                 self.syspkgs = syspkgs;
@@ -80,8 +74,7 @@ impl Worker for InstallAsyncHandler {
                 if work.block {
                     return;
                 }
-                let systemconfig = self.systemconfig.clone();
-                let rebuildargs = self.flakeargs.clone();
+                let config = self.config.clone();
                 match work.pkgtype {
                     InstallType::User => match work.action {
                         PkgAction::Install => {
@@ -268,7 +261,7 @@ impl Worker for InstallAsyncHandler {
                     },
                     InstallType::System => {
                         REBUILD_BROKER.send(RebuildMsg::Show);
-                        if let Some(systemconfig) = systemconfig {
+                        if let Some(systemconfig) = &config.systemconfig {
                             match work.action {
                                 PkgAction::Install => {
                                     info!("Installing system package: {}", work.pkg);
@@ -276,8 +269,7 @@ impl Worker for InstallAsyncHandler {
                                         match installsys(
                                             work.pkg.to_string(),
                                             work.action.clone(),
-                                            systemconfig,
-                                            rebuildargs,
+                                            config,
                                             sender.clone(),
                                         )
                                         .await
@@ -305,8 +297,7 @@ impl Worker for InstallAsyncHandler {
                                         match installsys(
                                             work.pkg.to_string(),
                                             work.action.clone(),
-                                            systemconfig,
-                                            rebuildargs,
+                                            config,
                                             sender.clone(),
                                         )
                                         .await
@@ -350,10 +341,19 @@ impl Worker for InstallAsyncHandler {
 async fn installsys(
     pkg: String,
     action: PkgAction,
-    systemconfig: String,
-    flakeargs: Option<String>,
+    config: NixDataConfig,
     _sender: ComponentSender<InstallAsyncHandler>,
 ) -> Result<bool> {
+    let systemconfig = config.systemconfig.unwrap_or_default();
+    let flakeargs = if let Some(flake) = config.flake {
+        if let Some(flakearg) = config.flakearg {
+            Some(format!("{}#{}", flake, flakearg))
+        } else {
+            Some(flake)
+        }
+    } else {
+        None
+    };
     let mut p = pkg;
     let f = fs::read_to_string(&systemconfig)?;
     if let Ok(s) = nix_editor::read::getwithvalue(&f, "environment.systemPackages") {
@@ -415,6 +415,8 @@ async fn installsys(
     let mut cmd = tokio::process::Command::new("pkexec")
         .arg(&exe)
         .arg("config")
+        .arg("--generations")
+        .arg(config.generations.unwrap_or(0).to_string())
         .arg("--output")
         .arg(&systemconfig)
         .arg("--")
diff --git a/src/ui/updateworker.rs b/src/ui/updateworker.rs
index 329cc2a..5360537 100644
--- a/src/ui/updateworker.rs
+++ b/src/ui/updateworker.rs
@@ -17,8 +17,7 @@ use super::{
 pub struct UpdateAsyncHandler {
     #[tracker::no_eq]
     process: Option<JoinHandle<()>>,
-    systemconfig: String,
-    flakeargs: Option<String>,
+    config: NixDataConfig,
     syspkgs: SystemPkgs,
     userpkgs: UserPkgs,
 }
@@ -60,8 +59,12 @@ impl Worker for UpdateAsyncHandler {
     fn init(params: Self::Init, _sender: relm4::ComponentSender<Self>) -> Self {
         Self {
             process: None,
-            systemconfig: String::new(),
-            flakeargs: None,
+            config: NixDataConfig {
+                systemconfig: None,
+                flake: None,
+                flakearg: None,
+                generations: None
+            },
             syspkgs: params.syspkgs,
             userpkgs: params.userpkgs,
             tracker: 0,
@@ -71,27 +74,17 @@ impl Worker for UpdateAsyncHandler {
     fn update(&mut self, msg: Self::Input, sender: ComponentSender<Self>) {
         match msg {
             UpdateAsyncHandlerMsg::UpdateConfig(config) => {
-                self.systemconfig = config.systemconfig.unwrap_or_default();
-                self.flakeargs = if let Some(flake) = config.flake {
-                    if let Some(flakearg) = config.flakearg {
-                        Some(format!("{}#{}", flake, flakearg))
-                    } else {
-                        Some(flake)
-                    }
-                } else {
-                    None
-                }
+                self.config = config;
             }
             UpdateAsyncHandlerMsg::UpdatePkgTypes(syspkgs, userpkgs) => {
                 self.syspkgs = syspkgs;
                 self.userpkgs = userpkgs;
             }
             UpdateAsyncHandlerMsg::UpdateSystem => {
-                let systemconfig = self.systemconfig.clone();
-                let flakeargs = self.flakeargs.clone();
+                let config = self.config.clone();
                 let syspkgs = self.syspkgs.clone();
                 relm4::spawn(async move {
-                    let result = runcmd(NscCmd::All, systemconfig, flakeargs, syspkgs, None).await;
+                    let result = runcmd(NscCmd::All, config, syspkgs, None).await;
                     match result {
                         Ok(true) => {
                             sender.output(UpdatePageMsg::DoneWorking);
@@ -104,12 +97,11 @@ impl Worker for UpdateAsyncHandler {
                 });
             }
             UpdateAsyncHandlerMsg::UpdateSystemRemove(pkgs) => {
-                let systemconfig = self.systemconfig.clone();
-                let flakeargs = self.flakeargs.clone();
+                let config = self.config.clone();
                 let syspkgs = self.syspkgs.clone();
                 relm4::spawn(async move {
                     let result =
-                        runcmd(NscCmd::All, systemconfig, flakeargs, syspkgs, Some(pkgs)).await;
+                        runcmd(NscCmd::All, config, syspkgs, Some(pkgs)).await;
                     match result {
                         Ok(true) => {
                             sender.output(UpdatePageMsg::DoneWorking);
@@ -122,16 +114,15 @@ impl Worker for UpdateAsyncHandler {
                 });
             }
             UpdateAsyncHandlerMsg::RebuildSystem => {
-                let systemconfig = self.systemconfig.clone();
-                let flakeargs = self.flakeargs.clone();
+                let config = self.config.clone();
                 let syspkgs = self.syspkgs.clone();
                 relm4::spawn(async move {
                     let result = match syspkgs {
                         SystemPkgs::Legacy => {
-                            runcmd(NscCmd::Rebuild, systemconfig, flakeargs, syspkgs, None).await
+                            runcmd(NscCmd::Rebuild, config, syspkgs, None).await
                         }
                         SystemPkgs::Flake => {
-                            runcmd(NscCmd::All, systemconfig, flakeargs, syspkgs, None).await
+                            runcmd(NscCmd::All, config, syspkgs, None).await
                         }
                         SystemPkgs::None => Ok(true),
                     };
@@ -183,12 +174,11 @@ impl Worker for UpdateAsyncHandler {
                 });
             }
             UpdateAsyncHandlerMsg::UpdateAll => {
-                let systemconfig = self.systemconfig.clone();
-                let flakeargs = self.flakeargs.clone();
+                let config = self.config.clone();
                 let syspkgs = self.syspkgs.clone();
                 let userpkgs = self.userpkgs.clone();
                 relm4::spawn(async move {
-                    let result = runcmd(NscCmd::All, systemconfig, flakeargs, syspkgs, None).await;
+                    let result = runcmd(NscCmd::All, config, syspkgs, None).await;
                     match result {
                         Ok(true) => {
                             match match userpkgs {
@@ -212,12 +202,17 @@ impl Worker for UpdateAsyncHandler {
                 });
             }
             UpdateAsyncHandlerMsg::UpdateAllRemove(userrmpkgs, sysrmpkgs) => {
-                let systemconfig = self.systemconfig.clone();
-                let flakeargs = self.flakeargs.clone();
+                let config = self.config.clone();
                 let syspkgs = self.syspkgs.clone();
                 let userpkgs = self.userpkgs.clone();
                 relm4::spawn(async move {
-                    let result = runcmd(NscCmd::All, systemconfig, flakeargs, syspkgs, Some(sysrmpkgs)).await;
+                    let result = runcmd(
+                        NscCmd::All,
+                        config,
+                        syspkgs,
+                        Some(sysrmpkgs),
+                    )
+                    .await;
                     match result {
                         Ok(true) => {
                             match match userpkgs {
@@ -246,11 +241,20 @@ impl Worker for UpdateAsyncHandler {
 
 async fn runcmd(
     cmd: NscCmd,
-    systemconfig: String,
-    flakeargs: Option<String>,
+    config: NixDataConfig,
     syspkgs: SystemPkgs,
     rmpkgs: Option<Vec<String>>,
 ) -> Result<bool> {
+    let systemconfig = config.systemconfig.unwrap_or_default();
+    let flakeargs = if let Some(flake) = config.flake {
+        if let Some(flakearg) = config.flakearg {
+            Some(format!("{}#{}", flake, flakearg))
+        } else {
+            Some(flake)
+        }
+    } else {
+        None
+    };
     let f = fs::read_to_string(&systemconfig)?;
     let exe = match std::env::current_exe() {
         Ok(mut e) => {
@@ -293,6 +297,8 @@ async fn runcmd(
         NscCmd::Rebuild => tokio::process::Command::new("pkexec")
             .arg(&exe)
             .arg("rebuild")
+            .arg("--generations")
+            .arg(config.generations.unwrap_or(0).to_string())
             .arg("--")
             .arg("switch")
             .args(&rebuildargs)
@@ -318,6 +324,8 @@ async fn runcmd(
                         .arg("channel")
                         .arg("--rebuild")
                         .arg("--update")
+                        .arg("--generations")
+                        .arg(config.generations.unwrap_or(0).to_string())
                         .arg("--output")
                         .arg(&systemconfig)
                         .arg("--")
@@ -337,6 +345,8 @@ async fn runcmd(
                         .arg(&exe)
                         .arg("channel")
                         .arg("--rebuild")
+                        .arg("--generations")
+                        .arg(config.generations.unwrap_or(0).to_string())
                         .arg("--")
                         .arg("switch")
                         .args(&rebuildargs)
@@ -360,6 +370,8 @@ async fn runcmd(
                         .arg("--flakepath")
                         .arg(&flakepath)
                         .arg("--update")
+                        .arg("--generations")
+                        .arg(config.generations.unwrap_or(0).to_string())
                         .arg("--output")
                         .arg(&systemconfig)
                         .arg("--")
@@ -382,6 +394,8 @@ async fn runcmd(
                         .arg("--rebuild")
                         .arg("--flakepath")
                         .arg(&flakepath)
+                        .arg("--generations")
+                        .arg(config.generations.unwrap_or(0).to_string())
                         .arg("--")
                         .arg("switch")
                         .arg("--impure")
@@ -434,31 +448,28 @@ async fn updateprofile(rmpkgs: Option<Vec<String>>) -> Result<bool> {
     if let Some(rmpkgs) = rmpkgs {
         if !rmpkgs.is_empty() {
             let mut cmd = tokio::process::Command::new("nix")
-            .arg("profile")
-            .arg("remove")
-            .args(
-                &rmpkgs
-                .iter()
-                .map(|x| format!(
-                    "legacyPackages.x86_64-linux.{}",
-                    x
-                ))
-                .collect::<Vec<String>>()
+                .arg("profile")
+                .arg("remove")
+                .args(
+                    &rmpkgs
+                        .iter()
+                        .map(|x| format!("legacyPackages.x86_64-linux.{}", x))
+                        .collect::<Vec<String>>(),
                 )
-            // Allow updating potential unfree packages
-            .arg("--impure")
-            .stderr(Stdio::piped())
-            .spawn()?;
+                // Allow updating potential unfree packages
+                .arg("--impure")
+                .stderr(Stdio::piped())
+                .spawn()?;
 
-        let stderr = cmd.stderr.take().unwrap();
-        let reader = tokio::io::BufReader::new(stderr);
+            let stderr = cmd.stderr.take().unwrap();
+            let reader = tokio::io::BufReader::new(stderr);
 
-        let mut lines = reader.lines();
-        while let Ok(Some(line)) = lines.next_line().await {
-            REBUILD_BROKER.send(RebuildMsg::UpdateText(line.to_string()));
-            trace!("CAUGHT NIX PROFILE LINE: {}", line);
-        }
-        cmd.wait().await?;
+            let mut lines = reader.lines();
+            while let Ok(Some(line)) = lines.next_line().await {
+                REBUILD_BROKER.send(RebuildMsg::UpdateText(line.to_string()));
+                trace!("CAUGHT NIX PROFILE LINE: {}", line);
+            }
+            cmd.wait().await?;
         }
     }
 
diff --git a/src/ui/welcome.rs b/src/ui/welcome.rs
index 1b7d62c..4b0e4f1 100644
--- a/src/ui/welcome.rs
+++ b/src/ui/welcome.rs
@@ -224,6 +224,7 @@ impl SimpleComponent for WelcomeModel {
                     systemconfig: self.confpath.as_ref().map(|x| x.to_string_lossy().to_string()),
                     flake: self.flakepath.as_ref().map(|x| x.to_string_lossy().to_string()),
                     flakearg: None,
+                    generations: None,
                 };
                 sender.output(AppMsg::LoadConfig(config));
                 self.hidden = true;
diff --git a/src/ui/window.rs b/src/ui/window.rs
index 7f6f879..201cd21 100644
--- a/src/ui/window.rs
+++ b/src/ui/window.rs
@@ -415,6 +415,7 @@ impl Component for AppModel {
                     systemconfig: None,
                     flake: None,
                     flakearg: None,
+                    generations: None,
                 },
                 true,
             )
@@ -673,6 +674,7 @@ impl Component for AppModel {
                     systemconfig: systemconfig.clone(),
                     flake: self.config.flake.clone(),
                     flakearg: self.config.flakearg.clone(),
+                    generations: self.config.generations,
                 };
                 if editconfig(self.config.clone()).is_err() {
                     warn!("Failed to update config");
@@ -711,6 +713,7 @@ impl Component for AppModel {
                     systemconfig: self.config.systemconfig.clone(),
                     flake: flake.clone(),
                     flakearg,
+                    generations: self.config.generations,
                 };
                 if editconfig(self.config.clone()).is_err() {
                     warn!("Failed to update config");