We have a issue with BE 2014,there is one job is failed due this error "
An error occurred during the snapshot cleanup, or could not locate a snapped volume from which to back up.
Final error category: System Errors
Turn off shadow copy and then turn it on again with unlimited disk usage and try again.
What type of data are you backing up ? Flat-files, CIFS shares, application data ?
Secondly, is BE 2014 updated with SP2 ?