How can I store the following desktop cryptocurrency wallets on a USB flash drive?

- OKCash Client
- Verge Electrum Wallet
- Reddcoin Core Wallet
- RevolutionVR Wallet
- Bitbay Marketplace Client

Do I simply disconnect the internet, plug in a flash drive, click on "backup wallet", an voila`? Is it that simple?

Would this process restore my wallets (with balances) in the event I purchased a new PC that has none of the wallet files installed on it?

FYI: All my other cryptocurrencies are on Ledger Nano S (Ledger doesn't support the above-mentioned coins).