Hi guys. As a iflt holder I've got some questions to you

Am I thinking correct? I just need to backup my wallet once? Any time I lost my wallet I can recovery it with my first backup and all my coins will be there, yes? even if my wallet while backup had 15 milion coins, and after some time it has 20 milion
Second question: When the 800$ pos will switch to 80%. How can I check it? I want to buy much more coins and stake it.
Third question: I'm staking coins for 1 week now, and now my staking status is: "You don't staking because you don't have mature coins" Why? What happend? I've got 20 milion iflt coins now which are spendable.
Thanks for help and sory for newbie questions but i'm new in pos
The wallet.dat is the important part....for any QT Core wallet you can recover as long as you have the wallet.dat. For other coins such as doge, if running multi doge you must have the private keys in order to recover, however again the core wallet can recover via the wallet.dat
800% to 80% should be within the next 60 days, likely much less, people reporting that we may already be in it, but when I look at my stakes and run the math I don't believe we are yet, I believe more people are staking more coins, so the network weight is being distributed differently resulting in less frequent or lower stakes.
Make sure the wallet is encrypted, close the core wallet, reopen and unlock. Wait 24 hours and coins should be staking.
Hope I've answered all of your questions.