Sorta OT - Backup solutions Mac to FreeBSD

[Gable Barber]

Hello all,
I have been poking around the 'Net a bit looking for an easy to use
backup solution for our Mac's (1 mini, 1 powerbook, more in the
future).

Basically there is a server, offsite (FBSD 6.2) with 2 RAID 5 arrays.
I would like to be able to set the 2 (for now) clients to
automatically, incrementally backup certain directories, nightly.
Something encrypted would be nice aswell.

This one looks interesting to me:

http://sourceforge.net/projects/areca/

If anyone has used an open source solution for this , I would
genuinely appreciate hearing about it.

Thanks in advance -

Gable Barber