My two cents; bcuz I used to have to manage the Disaster Recovery Handbook for my last employer (and this is not just for DB recovery...)
"Your Data Backup is only as trustworthy as your last test restore. Any data beyond that should be considered suspect.
"Your Disaster Recovery model is only as good as your last survived disaster. "
Not saying you should test restore every day,,, but you should at random intervals test your backups and your recovery models.