In case anyone reads this... I believe I have my answer.  If an online backup is already running, the freeze/thaw doesn't affect it however it doesn't look like the freeze actually works...so you end up with a bad snapshot.

If you try and start an online backup while the instance is frozen it tells you there's already a backup running and will not let you start the online backup.

I installed screen and it looks promising !   Gonna give it a try, thank you Alexander !

Ok... so I think I might be on to something.   What Class Name should I use for the Process setting for a CSV to HL7 interface ?