my friends lost his coins from offline wallet when he was chatting online on facebook messenger
sure he can't restore his coin
so how can protect offline wallet ?
Offline wallet is very safety wallet for saving your coins, you can hold multiple kinds altcoin in your offline wallet because very safety than you save your coin in online wallet like myetherwallet and exchange wallet, you can hold or save your coins in offline wallet how long time do you want and keep safety, but you have save your ledger offline wallet in correct place and never move to other hands.