The Admin Console contains a user interface for configuring regular snapshots.
The default retention period for snapshots is 1 month.
Setting the retention only affects snapshots created after the time of the change.
For example, if an existing snapshot had a retention of 1 year and is already 6 months old, and a user then uses the UI to change the retention to 1 month, the existing snapshot will still be around for another 6 months.
Check out the screenshot below for instructions on how to enable and configure automatic scheduled snapshots.