[CentOS] backup / compressed copy

Hi,

I think about buying a NAS-server from Sun. To backup this server I want to use our central to-tape backup. For whatever reason ppl are asking me to make one compressed copy to disk and only backup this copy.

So to reduce load I'd like to have a script that:

identifies changed files only (using md5?) copies them and compresses them

storeBackup.pl does something similar, but keeps versions and creates hardlinks between them. (Is storeBackup in any CentOS repo? I know it from my SuSE box) Any ideas? Do I have to change storeBackup to my needs? (Would really hate that, because I'm not a Perl man)

regards, Andreas