Hi,
Timothy J Massey wrote on 2014-12-10 11:53:38 -0500 [Re: [BackupPC-users] How
to delete backups]:
> Holger Parplies <wbppc AT parplies DOT de> wrote on 12/10/2014 10:59:17 AM:
> > [...]
> > ***Never*** run BackupPC_nightly from the command line. ***Never*** advise
> > other to do so.
> > Really quite simple.
>
> Why not, exactly? I do it all the time. I'm not saying you're wrong: I
> just want to know where the harm might be. But you state the "never do
> that" in such strong terms, I'm wondering where the disconnect it.
BackupPC_link and BackupPC_nightly shouldn't run concurrently because of
race conditions in the code. As far as I remember, BackupPC_nightly might
remove (or chain-renumber) a file BackupPC_link is about to create a link
to, which would result in the file missing from the backup or containing
incorrect data. The odds of this happening might not be high, but why take
the risk? There might be further problems I am unaware of. If you let the
scheduler run BackupPC_nightly, it will take care not to run BackupPC_link
concurrently, so possible problems will be avoided. It will also receive
the statistical output from BackupPC_nightly, which, I believe, it won't
if you run BackupPC_nightly from the command line.
> [...]
> By the way, that's probably the best way to handle this problem. Set the
> FullKeepCnt and IncKeepCnt to 1, do a full backup and let BackupPC manage
> deleting everything for you! :)
I agree with that (except that it's "IncrKeepCnt" ;-) in that it is the
easiest and least error-prone way. This will leave you with one backup though,
so it's mostly equivalent to the "delete entire host" case (you have the
choice of running a backup after deleting the host depending on what you want)
except for backup numbering (deleting the host will restart at 0). If you want
to keep the last 10 backups, for instance, you would need to count your fulls
and incrementals and adjust the KeepCnts to match.
Regards,
Holger
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