change -w to -f for files, --no-compress, --override the backup folder. Now database provision is not mandatory instead -d database or -f files is possible. Add error messages and print them to STDERR. Add error message if no database and no file is provided
Add tests for -f, --no-compress, --override and adjust other tests e.g. that database is not mandatory
Start of implementation of error checking at backup. Backup not implemented yet
Add test scaffold