Also, NEVER EVER take any BTC on any boats. They say that there is much heartbreak among many owners of Bitcoin who have lost them in boating accidents.
Why that happens to owners of precious metals even more! They take their shiny with them, knowing that it is safer with them rather than in some dark hiding place at home. Until disaster strikes...
Found a soaked cellphone at the beach once.
The disaster on precious metals is their lack of replication-ability. Try to backup a goldbar (gold wire 3D printer anyone?). If the usual precautions are applied on your wallet.dat like on any other valueable data, it should be undestroyable, unbreakable.