A backup that nobody can restore is a memory of preparedness rather than preparedness itself.

A backup nobody has ever restored is a belief rather than a safeguard. The files may be corrupt, the process may not work, the password may be lost, and none of this is discoverable until the day you need it and have no capacity to solve it. Untested preparation is a feeling of being prepared.

So restore one. Pick a file, actually recover it, and confirm the whole chain works. This applies well beyond data: the emergency plan, the spare key, the document you assume is somewhere. The test is usually quick, mildly tedious, and the only thing that turns an assumption into a fact.