We had a backup fail this week with an error stating something to the lines of Exchange Writer is in a failed state. After some digging around I found that the Microsoft Exchange Replica Writer was in a failed state. To check the writers do the following: Open the command prompt on the Exchange server where the backup is failing. (In my case the server with the passive copies) In the command prompt type: vssadmin list writers and hit enter. You will now see a list of all the writers with their current state. The picture below shows the writer in the failed state. To resolve this issue I had…