Backups

Periodic export of ZFS pool to external USB drive

[root@freenas] ~# zpool list
NAME           SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
archive       7.25T  4.17T  3.08T         -    14%    57%  1.00x  ONLINE  /mnt
freenas-boot  3.72G  2.27G  1.45G         -      -    60%  1.00x  ONLINE  -
usb-backups   1.81T   396K  1.81T         -     0%     0%  1.00x  ONLINE  /mnt

# Intial

zfs snapshot -r archive/backups@2015-09-22
zfs send -R archive/backups@2015-09-22 | zfs receive -vF usb-backups


...

# Incremental after that

zfs snapshot -r archive/backups@2015-09-23

# For each intermediate snapshot...
zfs send -R -i  archive/backups@2015-09-22 archive/backups@2015-09-23  | zfs receive -vF usb-backups

# export the backup pool
zpool export usb-backups


# decrypt device ...

# import the backup pool
zpool import usb-backups