Error Message: API Call failed with message: An error occurred while quiescing the virtual machin (4043602)

When attempting to run a Quiesced backup of an Exchange server you may receive an error indicatiing the snapshot failed.

There are several causes/resolutions for this issue. Two common issues are:

• The Exchange server Windows System Event Logs contain VSS Writer errors indicating insufficient resources available. Adding more memory or CPU to the VM can resolve this.
• The Exchange server Windows Application Event logs contain Warnings from the Exchange IS that information stores are already in a quiesced state. This can be caused by another application, such as BackupExec on NTBACKUP, performing a backup of the Exchange Information stores. To resolve this either cancel running the other backup or change the schedule.