The Golden Rule of Computing
Regularly test your backups. Such as once a month (common data) or once a week (critical data). Data loss occurs in basically two kinds of situations:
If you practice restoring from backups every so often, then you are much more likely to be resilient in the case of computer problems.
If your computer processes depend on specific hardware or software setups, then document these requirements along with the data backups. That way, you can immediately begin provisioning the necessary components in the event of an outage. A little notetaking now saves a lot of pain later.