Yep that's what I meant, you go to File > Backup Wallet. So the keystore is your private key. Don't know why I didn't make that connection earlier
Yes, that should suffice, but also watch out for corrupt data. For example, if the medium you write your keystore gets corrupt, you will lose your private key. In other words, make several copies.
Never bothered with security. Any security system is a barrier. Which are built not only in front of the scammers, but also in front of you. And believe me, the fraudster is as easy to crack this barrier as you, in case of oblivion remember access.
This is not just about security. If you lose your private key, your data is lost forever. You don't need hackers for that, just your own mistake.