I have a clone of the system drive and database system from when I replaced the drives. It's one of those deals where the people who own the damned thing fear change. I have daily snapshots from the DB so I'm probably just fine migrating it, but the customer doesn't want anything about that machine (it's an IBM pedestal server from ~1993. A 75MHz Pentium I think) to change.
I did swap out the SCSI card and drives in 2009 and again in 2013 and at this point I'm just just waiting for something to properly break so I can have that machine bronzed or something.