A NAS is not a backup!

English Backup and data protection
6

For those running QuTS Hero, I would suggest regularly opening an SSH session and running this command:

zpool status -v

Here’s what this looks like:

[Jono@NA9D-NAS ~]$ zpool status -v
  pool: zpool1
 state: ONLINE
status: One or more devices has experienced an error resulting in data
	corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
	entire pool from backup.
   see: http://illumos.org/msg/ZFS-8000-8A
  scan: scrub repaired 0 in 0 days 00:15:53 with 2 errors on Sun Oct 19 00:15:58 2025
 prune: last pruned 409 entries, 2392 entries are pruned ever
        total pruning count #5, avg. pruning rate = 2986468 (entry/sec)
expand: none requested
 renew: none requested
config:

	NAME                                    STATE     READ WRITE CKSUM
	zpool1                                  ONLINE       0     0     2
	  mirror-0                              ONLINE       0     0     4
	    qzfs/enc_0/disk_0x1_24074767F6C0_3  ONLINE       0     0     4
	    qzfs/enc_0/disk_0x2_24534D52401A_3  ONLINE       0     0     4

errors: Permanent errors have been detected in the following files:

        zpool1/$SHADOW:<0x1> (181:1:0:5046392)
        zpool1/$SHADOW:<0x1> (181:1:0:5046393)

  pool: zpool2
 state: ONLINE
status: One or more devices has experienced an error resulting in data
	corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
	entire pool from backup.
   see: http://illumos.org/msg/ZFS-8000-8A
  scan: scrub repaired 0 in 5 days 04:25:26 with 16 errors on Fri Oct 24 04:25:37 2025
 prune: last pruned 2637224 entries, 15879437 entries are pruned ever
        total pruning count #5, avg. pruning rate = 3490183 (entry/sec)
expand: none requested
 renew: none requested
config:

	NAME                                        STATE     READ WRITE CKSUM
	zpool2                                      ONLINE       0     0   364
	  raidz1-0                                  ONLINE       0     0   728
	    qzfs/enc_0/disk_0x3_5000CCA27EC5F5A5_3  ONLINE       0     0     0
	    qzfs/enc_0/disk_0x4_5000CCA267CD00FE_3  ONLINE       0     0     0
	    qzfs/enc_0/disk_0x5_5000CCA273F0B2D9_3  ONLINE       0     0     0
	    qzfs/enc_0/disk_0x6_5000CCA27EC5A850_3  ONLINE       0     0     0

errors: Permanent errors have been detected in the following files:

        zpool2/$SHADOW:<0x1> (181:1:0:29628189)
        zpool2/$SHADOW:<0x1> (181:1:0:764458)
        zpool2/$SHADOW:<0x1> (181:1:0:12855854)
        zpool2/$SHADOW:<0x1> (181:1:0:784706)
        zpool2/$SHADOW:<0x1> (181:1:0:57489228)
        zpool2/$SHADOW:<0x1> (181:1:0:57232981)
        zpool2/$SHADOW:<0x1> (181:1:0:57499738)
        zpool2/$SHADOW:<0x1> (181:1:0:5362782)
        zpool2/$SHADOW:<0x1> (181:1:0:1036430)
        zpool2/$SHADOW:<0x1> (181:1:0:5493137)
        zpool2/$SHADOW:<0x1> (181:1:0:5355174)
        zpool2/$SHADOW:<0x1> (181:1:0:57241256)
        zpool2/$SHADOW:<0x1> (181:1:0:30161860)
        zpool2/$SHADOW:<0x1> (181:1:0:5499856)
        zpool2/$SHADOW:<0x1> (181:1:0:754404)
        zpool2/$SHADOW:<0x1> (181:1:0:13872636)
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