That's why backup verification is required for successful database restoration.

If your backup can't be used to recover the database, then backup is useless. It is great that you have backup of your databases, but you need to do more. You need to test your backups.

The ultimate test for any backup is a restore to a server (that you have already done), but there are a few other things you can do as well.

See this article

https://www.simple-talk.com/sql/backup-and-recovery/backup-verification-tips-for-database-backup-testing/