it might be an idea to try the procedure of doing it with a new ledger?
So as to have a kind of backup copy?
I see no point in that to be honest. Your backup is the paper where your seed is written down. You can have 10 different recovery phrases and only one device, and it would work. It would be a pain in the ass to keep resetting them to input a different backup, but it works. Replacing the Nano S would only be necessary if you have those old firmware versions that Lucius mentioned in his post.
Ledger nano S is not manufactured anymore and it is probably going to be unusable soon, since ledger is slowly increasing size of their apps all the time.
Actually, the newest Bitcoin app that they released a few weeks ago is smaller. The size shrank from 62kb to 56kb if I remembered the numbers correctly. I was surprised to see it.