> Isn't this situation better suited by implementing disk quota ?

Unfortunately, the sources in question are Windows shares based on desktop 
machines.  Hence our real, 'direct' control is limited to the server side 
(via. some kind of 'size throttling' through Amanda and/or SMB), or in 
creating a special 'shared backup partition' on each machine, size 
regulation coming from the physical size of the partition.  The idea of 
'size throttling' would be much more dynamic than physical partitions, but 
it's the 'kludgibility' of such that doesn't look too promising thusfar...

-- 
Daniel Bentley - Network Technician, QSI Corporation (www.qsicorp.com)
"Exploits care not whence the clicks come..."