dump -0uaC 32 -f /UFS2/root.dump /

USB接続のHDD
Filesystem 1024-blocks Used Avail Capacity Mounted on
/dev/ada0p2 72093308 4274716 62051128 6% /
devfs 1 1 0 100% /dev
/dev/da0p4 75643540 3182060 66410000 5% /UFS

restore -rf /UFS2/root.dump
Filesystem 1024-blocks Used Avail Capacity Mounted on
/dev/ada0p2 72093308 4274820 62051024 6% /
devfs 1 1 0 100% /dev
/dev/da0p4 75643540 3846476 65745584 6% /UFS2←root.dump
/dev/da0p2 72093308 4274680 62051164 6% /UFS1←restore