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Microsoft DPM Failing on Exchange 2007 Backup

I have a Windows Server 2008 64-bit with Exchange 2007 64-bit installed and working.  I've cleared up most issues now but have one that is still causing a major issue.  I've installed Microsoft DPM 2007 with SP1 on a separate server on a Server 2008 64-bit OS.  DPM 2007 works great on all of my other servers after I pushed out the agent (latest updated one from SP1).  However, after it installs on Exchange - it fails when I try to perform a backup with the error:
Triggering tape backup failed:

"Error 30216: DPM has detected a discontinuity in the log chain for Storage group First Storage Group on SERVERNAME.fqdn since the last synchronization.
Error details: Unspecified error (0x80004005)
Recommended action:
1. Consult the administrator of the Exchange server to rectify the problem. Please ensure that exchange circular logging is turned off. Synchronization jobs may continue to fail until this issue is resolved.
2. Last backup might have failed after log truncation.

In the Protection task area, click 'Create recovery point' and select 'full backup' option."

- Now exchange circular logging is turned off - and I don't see the option 'full backup' under create recovery point.  Any ideas what to look for?  Is this option enabled by default or does it have some prereq?  I am using a tape backup and all tapes and drives are loaded - but I do not have a backup disk(s).

1 Solution
jaelaeAuthor Commented:
Resolved.  The only solution was to:
- Dismount the store
- Stop the Transport Service
- Move all logs and the .edb file to another path  as a backup
- Delete all logs
- Mount the store
- Run a FULL Normal Backup with DPM 2007
- Start the Transport Service

This seems to have worked and although I hate manually deleting logs -  it seemed to do the trick.
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