I too am having the same problem.
SBS2003 SP2
BESR 7.03
Backing up to an external USB drive.
I will get this error:
Error EC8F17B7: Cannot create recovery points for job: Drive Backup of (C:\). Error EBAB001A: An unknown exception has occurred at .\DiscoI.cpp 279.
Details: 0xEBAB001A
Source: Backup Exec System Recovery
then at the next scheduled backup i will get:
Error EC8F17B7: Cannot create recovery points for job: Drive Backup of (C:\). Error EC8F1C25: bad allocation
Details: Unspecified error
I will get the second error every night until the server is restarted.
After the restart the backup will run fine for several days to a few weeks.
Then the cycle begins again.