It uses PostgrSQL. I’m paying an extra $2/month to keep the database on an external drive. So far, it’s only using 151 MB of the 20 GB. I don’t think I’ll run out of space for a while. But, this weekend, the larger server I move to will come with an 80 GB drive so I don’t think I really need an external drive. Currently, the DB doesn’t cost anything extra.

But, you reminded me, there is a cost to keeping a database backup. My server is in NYC1. I have an S3 bucket in NYC3 that will be use to hold 5 days of daily database backup, compressed. I pay $5/month for the 250 GB Digital Ocean S3 bucket, I believe.