>Without addressing your question, the real answer is for the backup process to notify users that have files open 2 minutes or so before it kills their connections - or, failing that, send a broadcast message to all w/s that may be running and logged in. That lets interactive users shut down gracefully; non-interactive or unattended processes will still get killed ungracefully - but that's no different from what's happening now.

The problem is, no one is addressing my question. Everyone has advice on how to change the backup process, which I don't own. I need to know about the possibility of data corruption when the plug is pulled on an open file that is idle.