Solution #00004374
Scope:
Yosemite Server Backup 8.1 and newer
Answer:
Yosemite Server Backup error 3135 often happens when there is an issue with Windows File Replication Services. It is suggested to check your Windows Event logs for errors related to this. If the error has only happened once, it may simply be due to the timing of the File Replication at the time of backup.
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https://campus.barracuda.com/solution/50160000000Hs0LAAS