Hello,
To resolve your issue, you have to install first the Microsoft Visual C++ 2015–2022 Redistributable (x64) – 14.38.33135 on DPM AND server to be backuped.
It is included inside of the setup or you can have it on internet.
On our workload, we encountered an other issue , no any existing exchange database can be backuped.
Error is :
Data consistency verification check failed for LOGS of Exchange Mailbox Database xxx on yyyy. (ID 30146 Details: Unknown error (0xc0000135) (0xC0000135))
On Exchage server, we have :
Microsoft Exchange VSS Writer backup failed. No log files were truncated. Instance b7df8fe4-2dea-40b3-88b5-b697ae7f7670. Database a4a99b99-6bac-47f4-8cf1-d14aba9ff55e.
The Microsoft Exchange Replication service VSS Writer (Instance b7df8fe4-2dea-40b3-88b5-b697ae7f7670) failed with error FFFFFFFC when processing the backup completion event.