I hope I came to right place to ask about GPG.
I have created secret, public, and sign keys and set expiration dates for all keys in case I lose an access to them or forget a keyphrase, etc. I have read the GPG manual and a couple of blogs (e.g. this one) but I did not find answers to my questions.
What is the best way to store the keys if I have to reinstall a system?
Can I still have an access to expired keys and e.g. decrypt old files?