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Also, a KS has 100mbps bp.

Do you have a link with more info on this setup?

I've never tried it, but something like this should work:

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=36&t=47029

It's a similar process to setting up Netatalk on any Ubuntu server to get Apple computers to recognize a Linux server as a Time Machine endpoint.

It should be noted that the Pi is really, really slow. Too slow for this sort of application, IMHO.

An actual Time Capsule can be annoyingly slow sometimes, and I would expect it to be about five to ten times as fast as a Pi-based solution.

The link you posted has some good advice though. Like not using HFS+. Apart from HFS+ arguably being an antiquated filesystem, the Linux driver is in a horrible state and will cause corruption when used in rw mode. ext4 is the sensible choice.

Same here, I have a Pi has an rsync remote for my git-annex repository, storing on an USB drive. The speed isn't impressive, but it works quite well.