I had a Veeam O365 backup repository issue earlier this week that made me pull out my hair. Thankfully, the fix is super easy!
Here’s the problem: I was attempting to backup some mailboxes and Veeam O365 backup threw this error:
Processing mailbox email@example.com failed with error: Value cannot be null.
Parameter name: repository
This made zero sense to me as I was having no issue processing other mailboxes. I did some digging and came up with nothing so I opened a case with Veeam. They did some digging around as well and then made the suggestion to repoint the repository settings in Veeam O365 Backup to another location and apply then point the settings back to original repository location and apply. It worked! These are the steps to follow:
- Disable your current O365 backup jobs (all jobs should show the red and white minus symbol)
2. Go to Options
3. Then change location:
Above is original location, change to something else and click Apply. Then, change it BACK to the original location and click Apply.
4. Finally, re-enable a job and run it, it should now complete.