induction is not about the buttons, induction is the method of heat transfer between the cook top and your pots. Just look for one wiht better phyiscal buttons that are not digital-ish. Miele and Bosch are usually safe bets.

nothing for now. but because of the implications it will increase the price.

if the data is mission critical have multiple backups for it, and test the restore process of said backups.

As for your raid vs software raid, just install truenas and throw it on there, use a LSI in IT mode and create a ZFS cluster. Don’t over think it.