Should you keep your backup data in a safe?

Backing up your data is important, and using Time Machine is a great way to do it. But do you need to go even further? Should you, say, go so far as to clone a drive and keep the drive in a a fireproof safe in their home bolted to the floor? A read asks:
Even if somebody steals my iMac and Time Capsule, it is very unlikely the safe will get stolen. And most likely the safe will survive a house fire. I also have an encrypted sparse bundle with mission critical financial data stored there. Given t