Hi,
I have the same issue :
DP 6.21
Disc Agent : 0538(b621)
The backup will failed with a tape and then all next backup will fail using that tape. After that, the tape is in poor state.
I don't know how to overcome that problem.
It appears randomly. A backup on a specific computer will work and next time, it will fail. Next it could work again.
I have no error in backup logs but the state is in Finished/Errors
I find in the Copies tab that the session of the created copy is in Failed.
Please Help !