3. Sorry, I think of the machines being backed up as clients, but BackupPC does call them hosts. rsync supports compressed transfers but that's not the scheme used for storage by BackupPC.
4. You may be thinking of the tasks that check for unreferenced files and recalculate the total pool size, which can both be split over multiple nightly runs. Robert Trevellyan On Sat, Jan 12, 2019 at 11:04 AM Jan Stransky <jan.stransky.c...@gmail.com> wrote: > Hi Robert, > > 1-2) This is what I would expect, I am currious if there is a way to > gradually compress the files; not all at once. > > 3) By the host, I meant host being backed up. And I am sure, it is not > used for the compression, unless compress option of rsync is used. But I > guess, this is uncompressed and compressed again on the server side. The > think is that Pentium N3700 is not very efficient worker, however i7, which > is backed up is different story.... > > 4) I think there is an option how big percentage of files is being checked > or so; what about this one? > > Cheers, > > Jan > Dne 12.01.2019 v 14:55 Robert Trevellyan napsal(a): > > Hi Jan, > > I think this is correct, but there are other experts who might chime in to > correct me. > > 1. Migration will not result in compression of existing backups. It just > allows V4 to consume the V3 pool. > > 2. After compression is turned on, newly backed up files will be > compressed. Existing backups will remain as they were. > > 3. Host resources are always used for compression, either because BackupPC > is doing the work, or because the filesystem does it natively. My BackupPC > pools are on ZFS with LZ4 compression enabled and BackupPC compression > disabled. > > 4. The closest thing would be using rsync with --ignore-times for full > backups, which isn't quite the same thing, or having the filesystem do it > (e.g. ZFS scrub). > > Robert Trevellyan > > > On Sat, Jan 12, 2019 at 7:51 AM Jan Stransky <jan.stransky.c...@gmail.com> > wrote: > >> Hi, >> >> I have few questions related to compression >> >> Currently, I have BackupPC 3 installed on Intel NUC with 4 core pentium, >> and since the compression significantly decreased backup speeds, I have >> turned it off. I am about to switch to v4, so it might be worth to >> reconsider, since the increments are not big, big data are already in >> the pool and v4 handles files differently. >> >> 1) If I start the migration with compression on, when would it happen? >> Would whole pool be compressed at once? >> >> 2) If the pool is uncompressed, and I turned it on, when will be >> uncompressed files compressed? On full backup, or never unless ti >> changes on the host? >> >> 3) Is there way to compress the files using the host resources? >> >> 4) Is integrity of the compressed file checked any time? >> >> Best regards, >> >> Jan >> >> >> >> _______________________________________________ >> BackupPC-users mailing list >> BackupPC-users@lists.sourceforge.net >> List: https://lists.sourceforge.net/lists/listinfo/backuppc-users >> Wiki: http://backuppc.wiki.sourceforge.net >> Project: http://backuppc.sourceforge.net/ >> > > > _______________________________________________ > BackupPC-users mailing listbackuppc-us...@lists.sourceforge.net > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki: http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ > > _______________________________________________ > BackupPC-users mailing list > BackupPC-users@lists.sourceforge.net > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki: http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ >
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