Required properties:

drive : <string>
Drive Identifier.
pool : <string>
Media pool name.
store : <string>
Datastore name.

Optional properties:

comment : <string>
Comment (single line).
schedule : <calendar-event>
Run sync job at specified schedule.
eject-media : <boolean>
Eject media upon job completion.
export-media-set : <boolean>
Export media set upon job completion.
latest-only : <boolean>
Backup latest snapshots only.
notify-user : <string>
User ID