I am working on a system which long term will store 10 million files on SSA 
RAID - yes that's million !

We obviously will not want to execute incremental style backups against these 
files due to the delays in scanning for date/time changes during this type of 
backup, but we will still have a fairly large number to backup on a daily basis 
- approx 25,000 avg file size 200k.

Does anyone have experience of these kinds of voumes, or any performance stats 
on anything that can be scaled to give us some idea of what kind of performance 
we can expect.

I suspect we will have to do some testing sooner than later.

Regards
Steve Watson.
Technical Consultant. Xinetica Ltd