ZFS Full backup and recovery from snapshot

[bigart]

Hi,
My goal is to make full system backup and recover it on the another machine with the same disk settings.
I'm following this guide:

Restore FreeBSD from a ZFS Snapshot ·

hashbang0.com

and I'm stuck on this command:
root@mfsbsd:/mnt # zpool create -o altroot=/mnt zroot missing vdev specification

Disks settings
root@mfsbsd:/mnt # zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT zroot 12.5G 390K 12.5G - - 0% 0% 1.00x ONLINE -

root@mfsbsd:/mnt # gpart show => 40 33554352 ada0 GPT (16G) 40 1024 1 freebsd-boot (512K) 1064 4194304 2 freebsd-swap (2.0G) 4195368 27262976 3 freebsd-zfs (13G) 31458344 2096048 - free - (1.0G) => 40 33554352 ada1 GPT (16G) 40 1024 1 freebsd-boot (512K) 1064 4194304 2 freebsd-swap (2.0G) 4195368 27262976 3 freebsd-zfs (13G) 31458344 2096048 - free - (1.0G)

Where I'm wrong ?

 

[bigart]

working command:

zpool create -o altroot=/mnt zroot mirror /dev/gpt/disk0 /dev/gpt/disk1

Sorry, I'm newbe

 

[free-and-bsd]

Well, how do you expect to CREATE a zpool named 'zroot' if one of that name already exists , according to your ' zpool list' output??
As per documentation, you need ' attach' command instead of ' create' for the pool that already exists:

#zpool attach $your_pool_name disk1(existing) disk2(which you want to add)

Check this page for that. And generally, zfs operations aren't very difficult and are well documented online.