Questions: What is a "reasonable and customary"  number of backup
copies
to keep? How long should they be kept? We are a University Hospital
environment.

Background: We use adsm to backup a number of Novell, Widows/NT and
AIX
boxes. We currently have 900+ gigabytes of ADSM managed data in a
TAPEPOOL.  It is growing at about 100 gigabytes a month.  Our default
policy currently is to keep 15 copies (VEREXISTS) of each file for 18
months (RETEXTRA). We would like to reduce this value to control
growth
in the storage pool.

For some of our data we have specific business requirements to keep a
certain number of copies for a certain period of time. My question is
not concerned with this data.  Rather it is directed at user data
owned
by many different people on Novell Fileservers. No specific retention
business requirements have been mandated for this data.

Any help would be appreciated.