~I was wondering if any formatting and change of the pc hard disk could make me lose the monero that I have in the mymonero wallet installed on the pc. obviously after formatting I would restore the system as before. thanks to those who will give me a hand!
Even if you restored the system, it's way safer to specifically back up the mnemonic seeds by that wallet, just write it down or save it somewhere that is truly secure.
I don't know the way of how you backup-restoring your system, and there's a chance that it might be some problems over the course when the device is restoring. So better safe than sorry.