Well, for anyone who finds this on Google.
If you really want to use Digital ocean hourly (which is what some people probably should be doing)
On this page they describe how to do it: https://www.digitalocean.com/community/tutorials/digitalocean-backups-and-snapshots-explained
Occasional Usage: Snapshots can also provide a way to use droplets for a limited time without having to pay for hours when the server is not in use. Should you only need to use a server for a certain time every so often, you can take a snapshot of your current configuration, delete the droplet, and spin the system back up as soon as you need it once again—the image will remain in your account. In such a way, you only have to pay for the amount of time that you will actually use the droplet each month.