Sync is not a session but a relationship, but unlike SnapMirror.
It is not a backup and does not have any versioning but a data mirror based on sync points in time.
In a sync relationship we will Copy every file once.
If you'd create a new file - it would be copied.
If you'd modify it later it would be copied again.
If you delete a file - Cloud Sync would try to remove it from the target (And will succeed if it is there)
If you'd delete it from the target - it will not be recopied (We plan to have a recopy function available soon).
The broker is not related to AVA in any way and Cloud Sync is whole is not relying or hinged upon any NetApp tech.
It is totally new IP, created to handle the transport problem of the hybrid cloud.
Thanks for the feature idea - I will raise it with the team.