Am 2014-11-29 um 22:11 schrieb Marc MERLIN:
On Sat, Nov 29, 2014 at 09:34:01PM +0100, Jakob Schürz wrote:
Hi there!
I made a script to do backup with btrfs on a external HD.
You can see the function, how it works, and how it's to be used on
my site http://linux.xundeenergie.at/doku.php?id=mkbtrbackup
The site is in german. An english one will follow later.
Do you want some explanations?
Sure, how is it different from those 3?
https://btrfs.wiki.kernel.org/index.php/Incremental_Backup#Available_Backup_Tools
Wheter i haven't seen it, or this scripts can't do recursive backup...
If you have subvolumes in subvolumes (for example: /home, /home/user1,
/home/user2 /var, /var/spool, /var/lib are extra subvolumes IN the
normal filetree from linux), my script takes them all.
It looks on the external storage, if there's an older snapshot (i call
all subvolumes together in this case a snapshot!!) which is also on the
local machine. If so, is makes a incremental backup. If not, a initial
transfer is started. For each subvolume in the snapshot!
And my script changes the fstab-entry in the new snapshot.
The original has the option "subvol=@SUBVOL", where @SUBVOL is the name
of the original system.
It changes the @SUBVOLUME to the subvolume-id, so you can mount your
snapshot easy.
One Point is missing... Modifying of grub to serve boot-menu-entries for
older snapshots.
You get a systemd-unit, in the tarball, which makes a snapshot from your
system, on successful boot, so you can switch back fast, if an update
destroyed your system.
And it is for minimal-systems... no python, no perl, no java... only
shell(bash) :-)
regards
jakob
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