Holger Parplies wrote, On 4/30/2007 5:32 PM: > Hi, > > 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)." Thanks. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ BackupPC-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
