data recovery

Hello! I am at my wits' end. I was trying to boot from a mirror and had some problems. I used zpool detach for the drive that the system could boot with. I Tried a some things but due to my stupidity at some point I used dd to clone the drive that could boot to the one I was trying to boot...

Hi. I am experiencing pretty major corruption on a large-ish ZFS pool. And am wondering if anybody has seen similar or has some tips to aid recovery. I have rolling snapshots setup using zfsnap. But I only have backups of my most critical data from this pool. I'm running FreeBSD 12.2-RELEASE...