What's wrong with SQLite? Backup is a cron job to move a file. Keep the db in the same place as the site if it is low value. No expense but the expense you a

What's wrong with SQLite? Backup is a cron job to move a file. Keep the db in the same place as the site if it is low value. No expense but the expense you already have made for whatever server is hosting the content that isnt the database. Basically every OS has drivers for it, and it has really good performance for such a small package (especially if you dont have oodles and oodles of data)