While everything you say is spot on, the vast, vast, majority of the space in /var/lib/backuppc is typically consumed by the (c)pool. Assuming you are using the same compression method, then the pool files should be mostly the same. I say 'mostly' since some files may change between when 'server1' vs 'server2' are doing their backups. So from a space conservation perspective there won't be too much duplication.
G.W. Haywood wrote at about 13:52:26 +0000 on Friday, January 17, 2025: > Hi there, > > On Fri, 17 Jan 2025, Christian V?lker wrote: > > Re: Backing up remote BackupPC? > > > just out of interest: > > > > I have two backuppc instances (4.x) running on two different locations. > > But they back up the same list of hosts. > > > > I was just thinking: what happens if I am going to backup the > > /var/lib/backuppc directory from server2 to server1 and vice-versa? As > > both servers? back up the same hosts there should be the same files, right? > > > > What happens with the disk usage on the host backing up the other? Due > > to some sort of deduplication I expect not too much increase on disk > > consumption. > > > Am I right? > > No. > > If you're using compression (why would you not be using compression?) > then I'd guess that you'll be backing up everything twice - one copy > being the compressed versions of your original files, and one being > the compressed versions of the compressed versions of the originals. > > Also there are logs which will be different, plus the directories in > which the backups are contained are named after the backup number, so > there's no reason for them to be the same on both backup servers - and > if that were your goal I think you'd have difficulty achieving it. > > Why would you want to do such a thing? I'd think that you would be > backing up a lot of information which is more or less useless, plus > causing a lot of unnecessary network traffic and server load. It's > very easy to configure BackupPC to ignore those directories. > > -- > > 73, > Ged. > > > _______________________________________________ > 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/
