Any idea when multi level incrementals will be supported by
BackupPC_dump?
On Tue, 2004-03-30 at 12:33, Craig Barratt wrote:
"Kevin Heneveld" writes:
We are using BackupPC 2.0.2 to backup several Win2K servers over t1
WAN links.
Due to the relative slowness of the WAN links we would like to be able
to do a FULL backup, say once a month (since it takes about 24 hrs to
do a full) and an incremental every evening.
As far as I can tell, the only option for SMB backups is for the
incremental to backup everything modified since the last FULL.
This gets to be huge and way to slow after only a few days.
Is there a way to have the incrementals only backup files modified
since the last INCREMENTAL? Why would you need to re-backup files
older than that? It seems like a waste of both bandwidth and time.
What am I missing, and is this possible w/o hacking the Smb.pm module?
Currently all incrementals are level 1, meaning they depend only
on the last full. Since 2.0.0, BackupPC internals support
multi-level incrementals (where later incrementals depend upon
other incrementals), but BackupPC_dump doesn't yet turn them on.
It shouldn't be too hard to do, but it didn't make the cut for 2.1.0.
One reason I didn't do it in 2.1.0 is that I haven't thought of a good
flexible config parameter specifying the incremental policy, and I'm
also planning on supporting only incrementals after the first full.
The latter step is meant for rsync and isn't appropriate for smb
or tar (since incrementals with smb and tar don't detect changes
like rename, delete, or create with an old mtime). The latter
step requires changes to the expiry policy, since you will want
to eventually get rid of the oldest full, and use it to "fill-in"
any dependent incrementals. A little tricky.
In any case, as Les suggested, running smb over a slow high-latency
link will be very slow. I recommend you try rsync. It still only
does level-1 incrementals, but rsync will be a lot faster and allow
you to do full backups more often.
Craig
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