A:AnswerYou will have the chance to write down your seed phrase when you initialize the Ledger account. As long as you have the seed phrase, you can recover your account. However that also means if someone gets ahold of that seed phrase, they can access your assets.
A:AnswerWhat do you mean private Ethereum networks?
It works perfectly well with Ethereum. If you're talking about a different, private EVM chain then I'm not sure
A:AnswerPlease look more into the blockchain/digital assets before you spend money on a ledger device. Your internet access has nothing to do with this whatsoever.