We test backups every week once or two times.
Until now everything works as it should be.
Very good, but will you share exactly what "We test backups" actually means to you? Would you mind sharing your step-by-step procedure to help others understand?
Do you do a full restore to a spare system and then verify that every file was restored correctly and the system is fully operational? I doubt it. Furthermore, it is NOT reasonable for anyone to expect that level of testing multiple times a week. (It might be appropriate to do a full restore test once a year as a requirement in a business continuity and disaster recovery plan.)
How do you test your backups?
