However, I have lost data in my lifetime. If you value your backups, check on them.
Also, if you're the kind of person who has a Synology, it means you had to buy a NAS, drives, and setup all the associated machinery for Time Machine over your network. Therefore, I feel it's not outside of the expectation that you can check on your backups. Even if it's just a quick test of a restored file or folders.