Following error was displayed while checking DFS replication backup on Windows Server 2012:

[ERROR] Failed to execute GetVersionVector method. Err: -2147217406 (0x80041002)

The issue was caused by a recent unexpected DFS server shutdown. Windows Server 2008 R2 and Windows Server 2012 by default do not automatically resume DFS replication after dirty DFSR JET database shutdown. For more info about this and how to re-start DFS replication manually read this post.

Window Server 2008 R2
Windows Server 2012