Navigate to the Droplet in the DigitalOcean Control Panel, and then click the Backups link. If at least one backup has been taken for your Droplet, it will be listed in the Droplet backups section:
Choosing Convert to Snapshot from the More dropdown will convert the selected backup to a DigitalOcean snapshot. Unlike backups, which are only retained for four weeks, a snapshot is retained until you delete it. When you choose to convert a backup into a snapshot, it will be removed from the list of available backups and added to the list of snapshots.
Once a backup is converted to a snapshot, snapshot pricing applies.
Converting a backup to a snapshot allows you to retain it indefinitely and copy it to different regions.