Symptoms

• one or more backup jobs on an unslung slug no longer run
  and/or
• you cannot modify an existing backup job in the standard Linksys web administration page.

Solution

Procedure

1. Locate the /share/hdd/conf/mnt/backup directory that records the running state of each backup job.
2. For each backup job there is a directory of the same name and a "lock" file called <your_backup_job_name>.pid representing the /usr/sbin/backup process. Locate the directory and the file for each wayward job.
3. Use ps -eaf to verify that /usr/sbin/backup is not actually running.
4. Delete the pid file(s) for your job(s).
5. Optional: delete the directory for each job also.

Cause and Prevention

Credit to Ian White for identifying the procedure