Any tips or recommendations for backup versus mirroring the boot disk?
Coming from the Mac? You're used to time machine? As far as I know, there is nothing like it on the PC.
Windows has a feature called File History that takes snapshots of your files so you can restore to any point. I've never used it. I used to plug an external drive into my Mac and tell it to do the time machine thing immediately, and then I'd disconnect the drive and not worry about it for a while. I'm going to guess File History will want to be more intrusive than that. Windows can't index the damned files reliably, I ain't trusting it to mess with file versioning. But I bet there's a way to get it to do its thing to a second drive as a backup.
But there's also the basic Windows Backup, which you can find on the start menu. It does immediate or regular backups. I don't use it, either.
My Windows backup solution is drag-drop to internal copy folders, and external backup drives. That puts me leagues ahead of most people, having backups at all, but for a career IT person it is shameful how much I hate Windows and refuse to use it properly lol.
Back when I did important things on Windows I used to have so many drives around that I'd make cloned copies of the boot drive as my monthly backup. In addition to drag-dropping the user files more frequently than that. The cheapest way to do this (this may not still be true) and still get faster-than-flash speeds, if you want to keep your multiple internal drives for regular use and do your backups to external drives, is to put an internal SSD in an empty external enclosure. It's like a bulky flash drive. Very speedy.