Required properties:

remote : <string>
Remote ID.
remote-store : <string>
Datastore name.
store : <string>
Datastore name.

Optional properties:

comment : <string>
Comment (single line).
owner : <string>
Authentication ID
remove-vanished : <boolean>   (default=true)
Delete vanished backups. This remove the local copy if the remote backup was deleted.
schedule : <calendar-event>
Run sync job at specified schedule.