If you had paid down all your debt, first of all congratulations and kudos!
Buckit also supports putting aside some cash for a rainy day. The truth is that most debt accumulates for folks because of unexpected emergencies. If you have set aside cash with the expectation that this might happen you can avoid this situation.
Savings goals work essentially the same way as debt goals. You setup a target and then put aside cash in your Buckit Savings Account. The only difference is that you don't need to pay anyone.
If you need the money you can transfer it out of your Buckit Savings Account at any point by clicking on the Buckit on the top left of your home screen and clicking "Transfer Money". This will allow you to move the money to any of your connected bank accounts.