Model t backup recommendations

What does everyone recommend as backup? Is it recommended to have 2 model Ts? How does it work? 2 model Ts or use the safe?

I have just setup a Model One as a backup for a Model T. I’ve found in the process that the Model One does not support ADA, my assumption was based on the 8000+ marketing.

How does a backup device work with unsupported coins like ADA?

Well, I mean, it doesn’t, as you found out?

You need to restore the seed on a device (or a hot wallet) that supports the coin that you are interested in.

I think this is a missunderstand (or knowledge) on how the seeds and backups work.

When restoring a wallet on another device, can this be restored to any wallet like Exodus or Ledger.