John Goerzen wrote: > On Wed, Nov 05, 2008 at 10:40:35PM +0100, Nils Breunese (Lemonbit) > wrote: >> John Goerzen wrote: >> >>> First, the on-disk compression format makes me nervous. It >>> appears to >>> use the deflate algorithm, but cannot be unpacked with either gzip >>> or >>> unzip. It would seem that the few bytes that adding a gzip header >>> means would be well worth it, since it would buy the ability to >>> extract it without using specialized tools. >> >> You can use the BackupPC_zcat binary to decompress individual files >> manually. > > Right, I'm aware of that. But that's a specialized tool. It requires > CPAN libraries, libraries from BackupPC's perl library, etc. 20 bytes > or so would get you something that gzip could uncompress.
Are you sure? I thought it also works on its own. Haven't tried it though. > There's still the question of a CRC. I don't know about that. >>> Secondly, I would love to be able to use bzip2 for the on-disk >>> compression of each backup. It appears that bzip2 can be used for >>> archives, but not the regular backups. Is this in the works >>> anywhere? >> >> In my experience bzip2 is a much more resource intensive algorithm >> than gzip. I wouldn't want to use that on my backups, they'd take >> forever to compress. > > Sure, it's resource-intensive, but why not offer it? I've got a Core > 2 Duo, and in tests using dar (similar to tar) with per-file bzip2 > compression, it performs well enough and has a space savings in the > neighborhood of 20% over gzip on my test set. > > It will certainly not be right for everyone, but why not the choice? Well, maybe because it was never implemented and you're the first person to ask about it. :o) Nils Breunese. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
