Good advice, personal story, good reviews of hardware wallets. Crypto currencies are still "Wild West", and both private and public thieves (i.e., governments) are out to confiscate as much currency as they can, widely used or not. Protect yourself. Back up, back up, back up.

Online wallets should be treated as temporary places to transfer Bitcoins et al. Smartphone/cellphone wallets are no better. Desktop wallets are the first step to long-term storage, but hardware wallets need to be considered, just like a fire-safe for the valuables in your house. Off-site storage as well! Diversify!