I don’t back up my drives, I replicate them.

There is a lesson about unnoticed data damage in someone's future.

What happens when a software bug, ransomware, or hardware problem destroys or corrupts that data over days or months?

I've been using ZFS for a little while now and have been intending to take advantage of snapshotting more. I'm going to have to try this out.

This is why you shouldn't use ZFS on a boot drive. Btrfs is much better and doesn't have the same issues. You can't use it for more than raid1 but most drives are single drive only. Just make sure to backup your luks security key in case of corruption.