Backing up streams (subversion/mysql dump)

[Philipp Riegger <lists@anderedomain.de>]

Hi,

I am looking for a backup solution for mysql databases and subversion
repositories. I think it would be more interesting to backup the dumps
from "svnadmin dump" and the corresponding mysql command.

Saving the dumps each time wastes a lot of disk space (and produces a
lot of unnecessary disk IO). Is there a way to save streams (or data
from stdin)? Since data from stdin has no timestamp and no user/group
information, maybe there is a way to create a fake tar file from stdin
and pipe that to tarsnap? I did some searching on the internet and read
the man page. This does not seem to be possible at the moment. Is that
correct?

Thanks,
    Philipp