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/
Re: [BackupPC-users] Different strategies on same host
Thanks for the feedback and pointer to ClientNameAlias. This saves me creating an alias at the OS level. Here is the doc page: https://backuppc.sourceforge.net/faq/BackupPC.html#_conf_clientnamealias_ On 2023-06-29 06:05, Guillermo Rozas wrote: Hi, what I do is to have two different hosts in the server configuration (myPC and myPC_photo), and both hosts have defined "ClientNameAlias" to the same real host name address (IP or host name, but help says dhcp must be disabled for the host). That way I can define two completely separated backup strategies for two sets of folders on the same host, it works like a charm. Best regards, Guillermo On Wed, Jun 28, 2023 at 10:00 PM Norman J. Goldstein wrote: I want to have a different strategy for backing up photos than for backing up documents that I am editing. Basically, it would be a rare event to do a full backup of my photos. I assume that the host name, say myPC, must correspond to myPC.pl in the pc folder. Does it sound reasonable to make myPC_photo an alias host name for myPC, and then myPC_photo.pl would list its own folders and strategy for backing up? ___ 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/ ___ 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/ ___ 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
> > *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: - retention policy for different folders is different (I keep my photos backup much longer than my system configuration) - 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) 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
Hi, what I do is to have two different hosts in the server configuration (myPC and myPC_photo), and both hosts have defined "ClientNameAlias" to the same real host name address (IP or host name, but help says dhcp must be disabled for the host). That way I can define two completely separated backup strategies for two sets of folders on the same host, it works like a charm. Best regards, Guillermo On Wed, Jun 28, 2023 at 10:00 PM Norman J. Goldstein wrote: > I want to have a different strategy for backing up photos than for > backing up documents that I am editing. Basically, it would be a rare > event to do a full backup of my photos. I assume that the host name, > say myPC, must correspond to myPC.pl in the pc folder. Does it sound > reasonable to make myPC_photo an alias host name for myPC, and then > myPC_photo.pl would list its own folders and strategy for backing up? > > > ___ > 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/ > ___ 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 2023-06-28 15:49, Norman J. Goldstein wrote: I want to have a different strategy for backing up photos than for backing up documents that I am editing. Basically, it would be a rare event to do a full backup of my photos. I assume that the host name, say myPC, must correspond to myPC.pl in the pc folder. Does it sound reasonable to make myPC_photo an alias host name for myPC, and then myPC_photo.pl would list its own folders and strategy for backing up? It seems like a pretty normal thing to do. *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. ___ 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/
[BackupPC-users] Different strategies on same host
I want to have a different strategy for backing up photos than for backing up documents that I am editing. Basically, it would be a rare event to do a full backup of my photos. I assume that the host name, say myPC, must correspond to myPC.pl in the pc folder. Does it sound reasonable to make myPC_photo an alias host name for myPC, and then myPC_photo.pl would list its own folders and strategy for backing up? ___ 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/
