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Bitshares can be backed on a USB drive, you need to download the bin file backup on an external device. I checked, and Digibyte is supported on the Ledger Nano S. Also, Verge is not supported for the moment on the Ledger or Trezor.

Coins supported on the Trezor:
https://doc.satoshilabs.com/trezor-faq/overview.html#which-coins-are-currently-supported

Coins supported on the Ledger:
https://www.ledgerwallet.com/products/ledger-nano-s

I should only have bought coins that can be backed up on one device :-)

You can buy ERC20 tokens on top of Ethereum :)

True , I have them in a myerherwallet, but I’m looking at such cold wallet to buy

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