Op 2/02/2011 16:47, Rodrigo Renie Braga schreef:
I run a Incremental Backup from Monday trough Friday and, with this
Pool (using the Volume Retention option), I want to keep only 1 day
of Incremental Backup history, but I'm keeping the Differental and
Full Backup for longer periods.
How will you restore from a second, third, ..., incremental backup
without the info from the previous backups? Without the info from
the previous incremental backups it'll be quite the annoying
experience if you need to restore a file that changed between your
full backup and the last incremental backup, involving bscan ...
I thought that, since Incremental Backups will be pruned after 24
hours, that the current Incremental Backup was always going to be
incremental from the last Differential or Full Backup, hence, I'd keep
only one Incremental Backup for that Client.
That would mean that, if I wanted to make de Full Restore of that
Client at Friday (for example), I could use the Incremental (that ran
that night) + Differential (that ran last Sunday) + Full (that ran at
the first Sunday of the month) to make the latest possible restore, or
just the last Differential + Full Backup that would be the "state" of
the machine last weekend... I don't know if this logic is correct or
possible...
I think you might be confusing different backup types here. Full backups
backup everything, differential backups will backup everything that has
changed since the last Full backup. An Incremental backup however will
backup everything that has changed since the last backup*of any type*,
be it incremental, differential, or full.
So in your situation, say you are in week 2, on Friday. You'd have these
backups:
*F* - I - I - I - I - I - *D - I - I - I - I - I*
Say you want to do a restore from that friday's backup, you'd need all
the backups marked in bold above. So if you let your incrementals expire
after 1 day, you'll be missing 4 incrementals to make a proper restore
from friday's incremental backup.
To come back to the example I typed before: if you need a file that
changed on wednesday, it won't be in the differential backup, or in the
incremental backup on friday. It'll only be backupped in the incremental
on wednesday!
Will Bacula always assume the Volume Retention from the Pool
being used period to Prune files? Even if a specifically set the
File Retention and Job Retention on the Client? Even if I have
different Pool for a single Client?
Volume retention always takes precedence over File or Job
retentions. There is no use keeping data for a backup on a volume
that "no longer exists" as far as bacula knows. As often mentioned
on the list: don't use file and job retention definitions in Pool
configs. They are bugged in the current version and don't work
correctly.
As far as I know pruning should happen on a per-pool basis,
applying the correct retention periods per pool. You might want to
make sure the retention periods set for your Full pool are correct
though.
If it happens on a per pool basis, then why the Incremental Job, which
is on a "pool.inc.muitobaixo" Pool prunes the Jobs (and Files) of a
Full Backup Job, that is on a "pool.full.muitobaixo" Pool? Or actually
that is NOT happening and something else could be pruning the Clients
files?
What does the configuration of your differential and full pools look
like? Did you change the retention values after you created the volumes,
or before? If you change retention values after you've created a volume
the new values won't apply until you run an update command in bconsole
and explicitly update the retention periods for your existing volumes.
You also might want to explicitly put some "AutoPrune = yes" values in
your pool config, as they should always be present for clarity.
Kind regards,
Jeremy
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