ZOO, which doesn't compress as well, is rather stable and I use it daily for text file transfers to customers. I just back them up to a saveset on one of the drives that uses Intersecting Concepts' DiskMizer dynamic disk compression softwre. The compression is decent and automatic. I'm sure Phil Katz will get the VMS flavor up to speed shortly. He's never let me down before.
Division is futile.
You will be approximated.