Having recently had compose.io delete my data on a free tier I suggest NEVER doing this... It might seem to work well enough for smaller sites, but one day, out of the blue, when you least expect it, they will delete your data.

Can I also recommend if you are decomissioning a free tier please switch access to the server off (firewall rules) before deleting the data and the backups! You can even charge for the data if people haven't responded to any emails you have sent.