On 2022-08-25 23:16, Pollard, Jim wrote:
[...]
From: Udo Kaune <u...@inet-hamburg.de>
Date: Thursday, August 25, 2022 at 4:05 PM
To: Pollard, Jim <jim.poll...@mail.utexas.edu>
Subject: Re: [Bacula-users] Silly question from newbie
Am 25.08.22 um 22:52 schrieb Pollard, Jim:
I see. So if my incrementals were daily then I would be able to
restore to a specific day. Otherwise my only options would be the
last full, or the last full + the differential?
Correct. If you aim for (just) getting back the latest version of
everything you might remove the "in-betweens". How far apart are your
Full backups? Please always cc to the list so that the community may
benefit from your findings.
One should be careful here.
Differential backups will hold changes since the last successful full
backup.
Incremental will hold changes since the last successful full,
differential
or incremental backup.
Please check the Job Resource -> Level -> Incremental here:
https://www.bacula.org/11.0.x-manuals/en/main/Configuring_Director.html
If you lose "in-betweens", e.g., you remove differential backups, you
will
lose the data covered between the time the differential backup and the
incremental backup that preceded it.
The incremental backup following the differential backup will cover only
the changes since the last successful backup, in this case differential.
So, in short, if you don't want to lose data, I would suggest to avoid
deleting "in-betweens".
Also, unless Bacula is configured specifically the way that backup jobs
end up on their own file volumes (e.g. single backup per volume),
deleting
a backup job will not free the space in the volume. Only the metadata
related to the deleted job will be deleted from the database.
You also mentioned that your backup is going to disks and to tapes.
Unless something changed in the newer versions of Bacula, the space
on the tape volumes as well as the data on the disk/file volumes will
not be reclaimed until the whole volume is recycled.
Regards
--
Josip Deanovic
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