All cryptocurrency coins ever mined are sitting on the blockchain on their owners’ addresses, so they are never actually lost.
What makes them lost is them becoming inaccessible with the loss of the private keys, which allowed their owners to access and transfer those coins.
Regularly generating backup copies of a wallet protects against broken, stolen or compromised software, as well as human errors. It is also important to use different mediums and methods to store your backups.
As there are several different wallet options, so too are there opportunities to diversify a wallet’s access points.
This diminishes the threat of theft, misplacement or failures.