Too add a schedule for your backup select "Edit Settings" at the top of the client.
Once you then click on the “Schedule” tab. Then click on the “+” icon at the right side.
When “+” icon you then see the popup window you select a hourly, daily, weekly, monthly or just a once only backup. Depending on your choice of schedule some settings will be greyed out. Once you have chosen what you want click "OK".
Then click "Save" to make sure the schedule will run.