You can enable backups during Droplet creation.
To create a new Droplet with backups enabled, from the DigitalOcean Control Panel, open the Create menu and select Droplets. Choose the distribution and Droplet size that fits your needs. Under the Add backups header, click the Enable Backups button:
Once you have selected any other options, choose a hostname for the Droplet and click Create.
If you’re using the API to create a Droplet, you can enable backups by adding
"backups": true to the request body.
To enable Droplet backups after creation, navigate to the Droplet page in the control panel, click the name of the Droplet, and click Backups on the Droplet menu.
Click the Enable Backups button to enable backups.