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 <mailto: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 > <mailto: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 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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