This information was provided by Bob Collins and may help resolve this error.
Investigation on my server indicates a lack
of disk space. My DFS (Distributed File System) service is filling a
certain directory with just enough staging files to limit disk space.
When
BackupAssist tries to run it errors out with the following email
message being sent to me:
Subject: Morning tape 1 encountered errors
message: Internal error 20100 occurred.
Once the DFS issue is cleaned and space is available, a manual start of
the backup can occur.
I am at a storage problem with this server and must increase the DFS
staging size. As such, I have turned off the DFS and the backups run
fine. This does not seem to be your software at all, it is my server
space.