Create example for backup script and documentation how to set it up

When the database is filled it is worth doing regular backups.

This can be done easily by using pgdump and putting the files into a zip archive (7zip preferred).

In Windows the batch script can be executed automatically on a regular basis be the Windows task scheduler.

A documentation is needed, which shows how to set up such a backup on a Windows server step by step.

This can also be implemented for the Konda database, which does not have such a backup at the moment.

Be careful not to expose your password in any screenshot or script!