Looking for USB pen-drive -> CD based backup system

I'm looking for a backup system that can satisfy the following usage
pattern: 

 Let me take a full backup on a a 512MB flash pen drive, and let me
 add deltas until it's full.  When the pen drive's full, I would like
 to make an ISO file and burn a CD, clear the flash drive, and start
 with a new full backup, followed by new deltas.

 I would like the resulting CDs to be self contained.  Ie. I would
 like to easily access any file on any day, without having to look at
 additional CDs.

Can hdup fit this bill?

Thanx!


- Steinar