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Re: [BackupPC-users] backuppc 3.2.1 incremental SMB backup question
2012-11-02 15:04:03
My concern is that to verify that a file can be pooled, it first has to be brought over from machine A (true?).
Thus, even if it is ultimately pooled & only costs 1 hard link in the backup for the host, there is all of the full backup overhead on machine A and all of the network traffic to get it to the backuppc machine to determine this. For a full backup of e.g. 100s of GB, this would be a huge overhead. In the case where only a few files have been added to A since the last full backup, that is almost completely redundant. I think I need to find a different solution :)
Perhaps naive, but I imagined the SMB incremental logic might have included something like:
if ( cannot find this file from A in host's backup tree ) {
put it there i.e. act as if the modtime were recent enough that it should be backed up this time.
}
Maybe there is something about "smbclient in tar mode" (not familiar with this) which prevents this?
Maybe it is a prohibitively expensive test?
On Fri, Nov 2, 2012 at 11:27 AM, Les Mikesell <lesmikesell AT gmail DOT com> wrote:
On Fri, Nov 2, 2012 at 11:37 AM, Jim Stark < jstarkjhealey AT gmail DOT com> wrote:
>
> 2) You can simply run full backups
>
> Performance hit? I understand pooling will avoid creating multiple copies,
> but cost in backup time?
structure sane - and if you have time to do them one night you can
probably do them every night, unless you have a large set of targets
and need to skew the full run days.
> I guess I'm mostly surprised that the incremental backup does not realize
> that there are files in the source that do not exist in the destination &
> back them up based on that, regardless of modtime.
It is running smbclient in tar mode. It doesn't know anything about
previous runs.
--
Les Mikesell
lesmikesell AT gmail DOT com
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