zfs external backup drive with snapshot and encryption
$ ls /dev/disk/by-id -alh
...
lrwxrwxrwx 1 root root 10 okt 24 06:06 ata-WDC_WD10EZEX-08M2NA0_WD-WMC3F1471486-part4 -> ../../sda4
...
For example, I'm going to use
/dev/disk/by-id/ata-WDC_WD10EZEX-08M2NA0_WD-WMC3F1471486-part4$ sudo apt install cryptsetup
$ cryptsetup luksFormat --cipher aes-xts-plain64 --key-size 512 --iter-time 10000 --use-random -y /dev/disk/by-id/ata-WDC_WD10EZEX-08M2NA0_WD-WMC3F1471486-part4
--cipherencryption algorithm--key-sizeencryption key size--iter-timeNumber of millisecond to spend P8KDF passphrase processing--use-randomuse /dev/random-yverify passphrase
Disk device can now be opened.
$ sudo cryptsetup luksOpen /dev/disk/by-id/ata-WDC_WD10EZEX-08M2NA0_WD-WMC3F1471486-part4 luks1
$ sudo zpool create ext-backup /dev/mapper/luks1
Example i have data set
tank/ROOT/home$ sudo zfs snapshot tank/ROOT/home@ext-backup
$ sudo zfs send tank/ROOT/home@ext-backup | pv | sudo zfs recv ext-backup/home
Or with incremental-backup
$ sudo zfs snapshot tank/ROOT/home@ext-backup20180101
$ sudo zfs send -R -i tank/ROOT/home@ext-backup tank/ROOT/home@ext-backup20180101 | sudo zfs recv ext-backup/hom
A good idea is to set the external drive to be read-only
$ sudo zfs set readonly=on ext-backup
After finished sending the snapshot, close the disk and export the pool
$ sudo zpool export ext-backup
$ sudo cryptsetup luksClose ext-backup
Reference:
Last modified 1yr ago