Bitcoins are really only a unique identifier for a electronically distributed ledger (Just about everyone is using electronic ledgers these days - like even your bank). You can save this code by other means (e.g., Optical Disk, Thumbdrive, Paper Printout). Copies of the ledger are stored on millions of computers around the world. It's very unlikely they'll all be destroyed by anything less than a life extinction event.
Well, then I’m going to make digital copies and counterfeit the bc’s. There’s only 20,000 of them, right? So I’m betting that people will misplace or inadvertently destroy their storage media and I’ll move right in. hahahahahhaa