[plug] encrypting drives on a samba server and backups

[Ari]

Hi all,

Okay, I need some guidance here. I've helped a mate get started with 
linux and he's happy using a FC11 install as a samba server (he wanted a 
copy of what I had, but with more hard drives for backing up his video 
editting, documents, etc etc). All is well with that, but after a recent 
theft he's worried about his files being accessed if the server or the 
backup drives are stolen. I'm not really sure where to start for 
encrypting things but still having them available to all his windows 
PCs. He has 3TB of storage drives (the FC11 install is on a separate 
small 40GB drive) with the entire drives shared via samba. I've got him 
using rsync for his backups to his external usb drives. Is it possible 
to encrypt the samba shared drives and still have samba be able to use 
them? What about the backups with rsync? I'm reluctant to admit I've 
never worked with encryption on linux drives before, and I know I really 
really should have as it's the sort of security measure that I should 
know about. Help please :-(

TIA,

Ari