ReadyNAS Pro to RN516 Upgrade

I'm happy to report that, after escalation at Netgear, this problem was resolved. It appears that the problem was caused by the Backup settings.

So here are the correct settings:

For a share called 'MUSIC'
- Created a job called 'MUSIC'

- Here are the settings for the job:
- General - Name: 'MUSIC'
- Source - Type: share
- Source - Name: share: MUSIC
- Source - Host: (null)
- Source - Path: /
- Source - Login: (null)
- Source - Password: (null)

- Destination - Type: remote
- Destination - Name: remote: Rsync Server
- Destination - Host: (ReadyNAS PRO)
- Destination - Path: MUSIC
- Destination - Login: (null)
- Destination - Password: (null)

- I've left the options under the Advanced, Schedule and Options tabs at defaults.

The critical aspect are the Source:PATH settings: adding the "/" prevents the embedding of a 2nd "MUSIC" folder back into the Destination Share

I'm glad this is resolved. Unfortunately, I wasted much time and effort with the 1st level of Netgear tech support who did not know how to fix this and, at one point, suggested shipping a new unit to solve the problem.
Thanks to StephenB and mdgm for extra-ordinary assistance!