Hard to crash something on purpose, but still a good practice if you want to knkow how to restore your WP website. I literally deleted everything including the database on the hoster's side, after making a fresh backup.

Here's what I did to restore everything:

• go to my hoster's database administration and create a new database
• open the new database in phpMyAdmin and import the db-backup
• if everything looks fine so far, then follow the next steps:
• from your backup open the wp-config file and change the db-settings accordingly (DB_NAME, DB_USER, DB_PASSWORD)
• save wp-config and load all of your WP backup up on the server again

You should be ready to go!