You aren't going to move a db from one platform type to another.  No way.
Your options are as follows: export and then import the server information
and client data, or keep the old server around until the data expires after
moving all of your clients to the new server.

If you have good, fast tape technology, export/import is a viable option
especially if all of your primary storage pool volumes are in the library.
Any manual intervention required will kill your chances of getting this done
in a reasonable amount of time.

I like the "keep the old server around" option with an export and import of
archive data from those clients using archive.  Once you get your client's
data (the full backup is done again) on the new server most of your restores
will come from that system anyway with a few "further in the past" restores
requiring the old server.

Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs CO 80949-1313
(719) 531-5926
Fax: (719) 260-5991
Email: lipp AT storsol DOT com
www.storsol.com
www.storserver.com