V-79-57344-65297 - The Linux or Unix resource is not responding. Backup set canceled.
Final error: 0xe000ff11 - A communications failure has occurred with a Linux or Unix resource.
This is caused because the path length is limited to 1750 bytes.
Workaround:
For backing up selected files, on very long path directories, those files can be copied / relocated on a shorter path using tar or physically moving those files to the smaller path directory.