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Norton 360 backup fails after one completion
 I run Norton 360 backups to a portable USB hard drive. This ran succesfully for a long time, with no problems.
 Recently, after running a fresh backup to an empty disk drive, I saw the messages "Never Run / Last Backup: Not available / Backup Sets: 0".
 Checked the USB drive; saw N360_BACKUP, ARestore & ARestore.loc files. These occupy 257 GB out of 931GB, i.e.plenty space.
 Checked "Manage Backup Sets". Found destination changed from the F: disk selected to Secure Online Storage, which I had not selected.
 Repeated running fresh backup to empty disk yesterday, with the same result.
 My diagnosis is that, after running successfully once to my F: hard disk, backup changes the destination to Secure Online Storage. This then means that there is then no operational backup set, and N360 backup fails.
How do I stop this and get backup to use my selected destination?