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docs: use zlib,6 compression in some examples, fixes #275

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This is what attic used by default, but borgbackup defaults to "no compression".

I just adjusted the command invocation, so we can keep the example output
(which shows that stuff was compressed).

Also: add FAQ item about compression.
This commit is contained in:
Thomas Waldmann 2015-10-16 01:18:37 +02:00
parent a96770636c
commit e7f25d7821
3 changed files with 15 additions and 3 deletions
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2
README.rst
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@ -90,7 +90,7 @@ Initialize a new backup repository and create a backup archive::
Now doing another backup, just to show off the great deduplication::
$ borg create --stats /mnt/backup::Tuesday ~/Documents
$ borg create --stats -C zlib,6 /mnt/backup::Tuesday ~/Documents
Archive name: Tuesday
Archive fingerprint: 387a5e3f9b0e792e91c...

11
docs/faq.rst
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@ -50,6 +50,17 @@ Which file types, attributes, etc. are *not* preserved?
Archive extraction has optional support to extract all-zero chunks as
holes in a sparse file.
Why is my backup bigger than with attic?
Why doesn't |project_name| do compression by default?
* attic was rather unflexible when it comes to compression, it always
compressed using zlib level 6 (no way to switch compression off or
adjust the level or algorithm)
* |project_name| offers a lot of different compression algorithms and
levels. Which of them is the best for you pretty much depends on your use
case, your data, your hardware - so you need to do an informed decision
about whether you want to use compression, which algorithm and which
level you want to use. This is why compression defaults to none.
How can I specify the encryption passphrase programmatically?
The encryption passphrase can be specified programmatically using the
`BORG_PASSPHRASE` environment variable. This is convenient when setting up

5
docs/usage.rst
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@ -201,8 +201,9 @@ Examples
--exclude '*.pyc'
# Backup the root filesystem into an archive named "root-YYYY-MM-DD"
# use zlib compression (good, but slow) - default is no compression
NAME="root-`date +%Y-%m-%d`"
$ borg create /mnt/backup::$NAME / --do-not-cross-mountpoints
$ borg create -C zlib,6 /mnt/backup::$NAME / --do-not-cross-mountpoints
# Backup huge files with little chunk management overhead
$ borg create --chunker-params 19,23,21,4095 /mnt/backup::VMs /srv/VMs
@ -315,7 +316,7 @@ Examples
Hostname: myhostname
Username: root
Time: Fri Aug 2 15:18:17 2013
Command line: /usr/bin/borg create --stats /mnt/backup::root-2013-08-02 / --do-not-cross-mountpoints
Command line: /usr/bin/borg create --stats -C zlib,6 /mnt/backup::root-2013-08-02 / --do-not-cross-mountpoints
Number of files: 147429
Original size: 5344169493 (4.98 GB)
Compressed size: 1748189642 (1.63 GB)