In case of filesystems I can think of as interesting for myself:
1) Windows FD has VSS support
2) In case of ZFS/LVM you can run a pre/post scripts creating a snapshot
and mounting it for reading then unmounting and removing snapshot after
backup.
I suppose you can pack it into a python plugin but on first glance it
seems as a bit of an overkill.
On 06.07.2021 14:27, 'Christian Svensson' via bareos-users wrote:
Hello,
I am curious about the state of snapshot management in Bareos (and Bacula).
It seems that in the past Bacula at least had ZFS/LVM/BTRFS snapshot
support[1] but that seems to have been removed at some point.
To me, the ability of taking backup of a complex filesystem using e.g.
BTRFS incremental snapshots[2] seems like a very nice feature to have
in Bearos.
It seems it would be quite trivial to add support for implementing
Full, Incremental, and even Differential backups using these
snapshots.
Why would I need this? Consistency. I would like to snapshot the
filesystem in a point-of-time, not relying on that the file daemon is
able to work fast enough for the backup to not diverge too much from
when it started to when it finished.
I can see two operation modes:
1) File-level:
Ideally the file daemon would sense that "hey, this is a btrfs volume,
I will take a snapshot to read all the files in the fileset from" and
it would be transparent to the sysadmin setting things up.
When the backup is complete, the snapshot is removed.
Changes are detected using the normal scanning of mtime etc.
2) Filesystem-level:
This is more involved but handles complete restores of the full FS
using "btrfs send" and "btrfs receive" but changes are instead handled
by btrfs, ensuring that all changed data is backed up regardless of
timestamps.
Thoughts?
If I wanted to implement (2), what would be a good way to do that - as
a python plugin?
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