Set the necessary user rights to fix the issue
A Microsoft Exchange Server backup, restore, or browse attempt fails with the following error messages:
A generic error of Microsoft Exchange Item Provider
Failed to browse Microsoft Exchange Server
Failed to create the process
A required privilege is not held by the client
A generic error of Microsoft Exchange Backuper
Failed to back up the information store
The current user does not have the required privileges
The current user's privilege 'SeIncreaseQuotaPrivilege' is not set
Acronis Managed Machine Service does not have the necessary rights to perform the operation.
Add the necessary rights to the user account manually.
If the issue persists, please make sure the correct user accounts with the required permissions are used. See Acronis Backup Advanced 11.7/11.5: Necessary User Accounts to Back Up Microsoft Exchange Server.