I do know many are using the Scheduled task with the Start and Stop time values for this but you will need a dedicated VPN (port 1723, GRE..) connection (need ports open 11000-14000as well) over a WAN. You can add many of the scheduled tasks as you need.

Function: Create schedule for volume replication task

Here you can create a schedule for the selected volume replication task.

Comment
You can enter a comment for the replication schedule.
Time select
You can start the volume replication immediately by selecting Now from the Time select drop-down list or schedule it for later.
Interval
Select the interval at which the replication will be executed.

Location
CONFIGURATION -> volume manager -> vol. replication -> Function: Create schedule for volume replication task.