> Well - what about doing differential backups every 2 or 3 weeks and
> incremental more often? Every differential backup will contain any changed
> file since the last full backup and if the incremental backups can be based
> on the last full+differential backup (i'm quite sure that is the case) , you
> should be able to purge all incremental volumes between last full and latest
> diff. In fact bacula should do so, if the retention period for incremental
> volumes is short enough and the pool conatins only a few volumes.
So instead of just using incremental backups, your saying I should do
a differential every so often and purge the files between each
differential?
This could work, the only problem I can see is that if a client moves
or adds lots of data to the server, the differential backups will take
some extra time unless I do another full backup, which is what I'm
trying to avoid. Bandwidth is extremely thin, with each client having
only 30-60KB upload bandwidth (ISP restriction), I need to prevent the
clients from backing up the same file (unchanged) more than once.
Using differentials kind of defeats the purpose in a low bandwidth
environment. This is also why I am investing time in studying
rsync-like functionality in order to improve bacula's low-bandwidth
performance.
This is why I need bacula to keep a preset instances of the same file,
whether it be 1, or 5... or based on some kind of time-presence stack,
where a preset number of the same file's changes are pushed in and out
of a specified time allocation (like a few weeks).
Perhaps I should turn this into a feature request or add the feature myself..
Sincerely,
--
Michael Short
Securenets
(901) 233-9926
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