SYMPTOMS
Microsoft Backup does not back up, compare, or restore files ending
with the following extensions if they reside in the same directory
from which Backup was started:
.BAK .RST
.LOG .SAV
.LST .SLT
.PRO .TMP
If you move the MSBACKUP.EXE file to another directory, Backup can
work with files with these extensions; however, it still does not back
up the MSBACKUP.TMP file.
With Backup in a new directory, it does not compare or restore the
following filenames:
DEFAULT.SET
DEFAULT.SLT
MSBACKUP.INI
MSBACKUP.RST
RESTORE.TMP