Hi George:
with 5.3 I experienced many issues including the incremental backup does not work. whenever I set it to "ON" next time the scheduled backup comes It fails and set itself back to "Off'. I did not get same message you get though.
I finally did two things:
- upgraded to latest patch.
- moved the log collector from the primary to the secondary.
Now things are fine for about 1 month without issues.
Regarding your issue, I think it could be related to resource issue as mentioned in the message.
What is the current DB size that you have?
Note that the message is misleading (messages I got with my ACS are the same) because they mention incremental backup in the message title and then say on-demand full backup failed!
So, you have to specify yourself if the issue with the incremental backup or the full backup?
HTH
Amjad
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