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.