Quick backup script.

I added a quick backup script, which backs up the following:

• All postgres tables
• The SSL certificate
• The environment variables

There are a lot of reasons that this script is not optimal:

• It relies on a bunch of external variables to be exactly right. (like the db user)
• It assumes the directory structure although it could change.
• It doesn't lock anything, meaning that writes could mess it up.
• It doesn't encrypt the backup yet (although I'm not sure that this script is responsible for this)
• It doesn't log anything
• I'm not sure whether we back up the right files. An argument could be made that we need to backup the entire docker containers. This depends on how we update however.