Holger Parplies wrote, On 4/30/2007 5:32 PM:
> Kris Jordan wrote on 30.04.2007 at 17:12:59 [[BackupPC-users] Incremental transferring same data over and over]:
>> Les Mikesell wrote, On 4/30/2007 4:23 PM:
>> > If you use rsync as the transport you never actually
>> > transfer unchanged files again - you only make a pass
>> > over the files comparing block checksums. This takes
>> > some time/cpu at each end but not a lot of bandwidth.
>> I'm using rsync (rsyncd on the client/Windows). I've noticed that
>> incremental backups will transfer the same files over and over again,
>> until the next full.
> actually, I'm just writing a reply in the original thread.
I had a question, so I thought it better to start a new one. "Les
Mikesell" just reminded me about this question.
> But to answer your question: your setup is behaving as it is supposed to.
> Each incremental is relative to the previous backup of lower level (with
> level 0 meaning full backup). By default, you only have full and level 1
> incremental backups, meaning an incremental is relative to the previous full.
> That's documented in the default config.pl preceeding the IncrLevels setting.
Multi-level incremental, knew about that. I just wasn't sure it was
right for even several level 1's transferring the same data over and
over, especially since I'm using rsync.
>> For instance, as a test...
>> 0 full 10min
>> Add a bunch of files.
>> 1 incr 6min
>> 2 incr 6min
>> 3 incr 6min
>> 4 full 0.1min
> That is surprising. It should take at least 6 minutes (transferring the same
> data as the incrementals). Probably more due to comparing block checksums of
> all unchanged files.
I have "--checksum-seed" on reducing compare times.
"same" (from documentation):
"file is identical to previous backup (contents were checksummed and
verified during full dump)."