Troubleshooting:
1) Restart the exchange information store and replication service.
2) Ensure all vss writers are healthy. vssadmin list writers
3) Ensure that if you do a get-mailboxDatabase -status | Fl *backup* that backup in progress shows as false.
Scenario 1: Failed VSS Writers
- There are instances when backups are failing due to an agent’s VSS writers being in a failed state, but it is impossible or not desirable to restart the server until at least after business hours.
Scenario 2: VSS Writers Not Started
- There may also be a writer that is not running and needs to be. Running the command vssadmin list writers will only show a list of writers that are currently started
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