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?
2) If a differential fails (is cancelled, disk fills up, whatever) will
subsequent incrementals be relative to whatever succeeded before the the
failed differential? Relative to a previous differential? Will subsequent
incrementals be promoted to differential?
3) If I delete a full backup from the catalog, will bacula know that any
dependant jobs are now orphans? If the next scheduled job is an
incremental, what happens? Does it do a full? Does it make the incremental
relative to the most recent full backup prior to the one I blew away?
4) is there a way to check that an incremental job has all the parts of the
chain needed to restore it?
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?
Thanks All
-Dylan
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