• https://docs.freebsd.org/en/books/handbook/zfs/

• NAS main (blank)
• ZFS'd

su -

zpool create 'NAS' '/dev/ada1'

zpool status 'NAS'

• NAS2 spare (wiped)
• Format NAS2 spare to NTFS
• Clone NAS main (ZFS) → NAS2 spare (NTFS)
• This formatted a 4TB drive with 2TB + rest split and isn't usable under Windows ¹⁾

su -

pkg install fusefs-ntfs rsync

kldload 'fusefs'

geom disk list

gpart destroy -F 'ada2' && dd if='/dev/zero' of='/dev/ada2' count='8096'

gpart create -s 'GPT' 'ada2'

gpart add -l 'NAS2' -t 'ms-basic-data' 'ada2'

NTFS_USE_UBLIO='0' mkntfs -Q -I -v '/dev/ada2'

ntfsfix '/dev/ada2'

mkdir -p '/mnt/NAS2' && ntfs-3g -o 'rw,big_writes,windows_names' '/dev/ada2' '/mnt/NAS2'

rsync --verbose --recursive --update --progress '/NAS/' '/mnt/NAS2/'

cp -R -v '/NAS/' '/mnt/NAS2/'

• NAS2 spare (GPT ext4 pre-formatted)
• Clone NAS2 spare (ext4) → NAS main (ZFS)

su -

pkg install fusefs-ext2 rsync

mkdir -p '/mnt/NAS2' && mount -t 'ext2fs' -o 'rw' '/dev/ada2p1' '/mnt/NAS2'

rsync --verbose --recursive --update --progress '/mnt/NAS2/' '/NAS/'