Re: [BackupPC-users] Different strategies on same host
On Fri, Jun 30, 2023, 04:18 Dave Sherohman via BackupPC-users < backuppc-users@lists.sourceforge.net> wrote > *I* don't do it, simply because there's little practical difference >> between rsync'ing directories that don't change and not rsync'ing them. >> > > Just to give reason *I* use it: > - the cost/benefit of doing full backups for different folders is > different (fulls take considerably longer than incrementals, and some > folders like "Downloads" are not worth that extra time) > > What's your transfer method? While retention policy is a good point, the > post you replied to is correct that there is no extra time required for > fulls when using rsync. > > [...] > > Fulls and incrementals take roughly the same amount of time when using an > rsync transfer method, because rsync only sends changed data over the wire > either way. > I use rsync. But although the *transfer time* is the same, the *checking time* is not. I use -c on the fulls, so checksums are generated for everything on the host for full backups (I don't remember if this is the default on BackupPC 4), while only metadata is checked on the incrementals. For a modest 600GB host that gives a 32 to 2 minutes time relation. Best regards, Guillermo > ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:https://github.com/backuppc/backuppc/wiki Project: https://backuppc.github.io/backuppc/
Re: [BackupPC-users] Different strategies on same host
On 6/29/23 15:11, Guillermo Rozas wrote: *I* don't do it, simply because there's little practical difference between rsync'ing directories that don't change and not rsync'ing them. Just to give reason *I* use it: - the cost/benefit of doing full backups for different folders is different (fulls take considerably longer than incrementals, and some folders like "Downloads" are not worth that extra time) What's your transfer method? While retention policy is a good point, the post you replied to is correct that there is no extra time required for fulls when using rsync. The largest machine I'm backing up has 24T on it. I currently have two level 0 backups stored for that machine, which took 12.5 minutes and 1.8 minutes to complete. I also have a rather large number (I'd estimate 30ish, but too lazy to count them) of level 1 backups, which range from 2.0 to 18.4 minutes, with a pair of outliers at 23.9 and 70.4 minutes. Aside from those two outliers (which are incrementals, not fulls!), there's no real difference in the time taken. Fulls and incrementals take roughly the same amount of time when using an rsync transfer method, because rsync only sends changed data over the wire either way. ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:https://github.com/backuppc/backuppc/wiki Project: https://backuppc.github.io/backuppc/
