[Tfug] backups?

[Andrew Huntwork]

i'd like to back up some files on 3 linux machines on my local network. 
  It's really just home directories and cvs that i care about.  I don't 
have a tape drive, just a cd writer and the hard drives on the 3 
machines themselves.  I started looking at amanda, but it seems to be 
highly dependent on a tape drive.  Is there any free program that will 
help me do this?  And what is the best backup strategy with my 
resources?  copying files around, or burning data to a bunch of cd's, or 
both?

Thanks for the help!