Hello,
2013/5/16 Dylan Martin <dylan.mar...@seattlecolleges.edu>
> Hi all, I'm pretty new to bacula and I love it so far. I was using
> duplicity to back up servers, which was not much fun.
>
> I'm working on deleting old backups to make space on my not-so-big backup
> disk, and in the process I'm trying to figure out what incremental and
> differential backups depend on what. From what I can tell, the catalog
> does not explicitly contain that information and it has to be inferred from
> the order backups were made.
>
> To review, The docs say that a full backup is everything, a differential
> is all the changes since the last full backup and an incremental is only
> the changes since the last backup of any kind. So, if I do a full backup
> followed by 10 incrementals, I need all 10 incrementals and the full backup
> to restore the system to the state is was at during the most recent backup.
> If I do a full backup, 5 incrementals, a differential and then 5 more
> incrementals, I would need the full backup, the differential and the last 5
> incrementals to restore the system to the state it was in at the most
> recent backup. if I do a full backup, 5 incrementals, a differential, 5
> incrementals, a differential, 5 incrementals, a differential and 5
> incrementals, I need the full backup, the last differential and the last 5
> incrementals. (sorry for the agonizing sentence, but I wanted to be
> clear).
>
> Now to my question(s):
>
> 1) Do I have it right so far?
>
Yes, absolutely.
>
> 2) If a differential fails (is cancelled, disk fills up, whatever) will
> subsequent incrementals be relative to whatever succeeded before the the
> failed differential?
>
Any diff or incr backups are based on timestamps.
> Relative to a previous differential?
>
The reference timestamp is the last successful backup required level. For
incr it will be any previous successful backup.
> Will subsequent incrementals be promoted to differential?
>
No.
>
> 3) If I delete a full backup from the catalog, will bacula know that any
> dependant jobs are now orphans?
>
I don't think so.
> If the next scheduled job is an incremental, what happens?
>
Depends, if you have any successful full backup for this job in catalog or
not.
> Does it do a full?
>
If you do not have one then incr will be promoted to full. If you have one
then it will be a standard incr backup.
> Does it make the incremental relative to the most recent full backup prior
> to the one I blew away?
>
Incr backups are "related" to previous successful backup any level with
exception above (backup level promotion).
>
> 4) is there a way to check that an incremental job has all the parts of
> the chain needed to restore it?
>
>
AFAIK, there is no dedicated command for that, but you can use restore
command to check if required backups are available.
> 5) If a train leaves Paris at 9:10 AM traveling at 80kmph and a bus leaves
> London at 8:45 am traveling at 30Mph, what is the angle at which they will
> intersect?
>
:)
best regards
--
Radosław Korzeniewski
rados...@korzeniewski.net
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