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.
There's still the question of a CRC.
>
> > 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?
-- John
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