advise or best practices with ZFS snapshot

[sesquivels at keemail.me]

Hello team, tank you for your time.

I was building ZFS pool

geom disk list
Geom name: nvd0
Providers:
1. Name: nvd0
   Mediasize: 512110190592 (477G)
   Sectorsize: 512
   Mode: r2w2e4
   descr: ADATA SX8100NP
   lunid: 00000000010000004ce00018dd8c9084
   ident: 2K26291JGN17
   rotationrate: 0
   fwsectors: 0
   fwheads: 0

Geom name: ada2
Providers:
1. Name: ada2
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e1
   descr: ST1000LM035-1RK172
   lunid: 5000c500a7f6b348
   ident: WDE31N7X
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada3
Providers:
1. Name: ada3
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e1
   descr: TOSHIBA MQ04ABF100
   lunid: 500003998238047c
   ident: 9915PKVBT
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada4
Providers:
1. Name: ada4
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e2
   descr: ST1000LM049-2GH172
   lunid: 5000c500b9fa0d1f
   ident: WGS1DNPB
   rotationrate: 7200
   fwsectors: 63
   fwheads: 16

Geom name: ada5
Providers:
1. Name: ada5
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e2
   descr: ST1000LM035-1RK172
   lunid: 5000c500b40a20b4
   ident: ZDEEM2PD
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada6
Providers:
1. Name: ada6
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e2
   descr: TOSHIBA MQ04ABF100
   lunid: 50000399eb100983
   ident: 30HOP52LT
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada7
Providers:
1. Name: ada7
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e2
   descr: ST1000LM035-1RK172
   lunid: 5000c500b3e1e35e
   ident: ZDEEF3X9
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada8
Providers:
1. Name: ada8
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e1
   descr: WDC WD10SPZX-22Z10T1
   lunid: 50014ee26897b98e
   ident: WD-WXB2AA00UENK
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada0
Providers:
1. Name: ada0
   Mediasize: 1000204886016 (932G)
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e1
   descr: TOSHIBA MQ04ABF100
   lunid: 5000039a6b124e9a
   ident: Y0PPP0UWT
   rotationrate: 5400
   fwsectors: 63
   fwheads: 16

Geom name: ada1
Providers:
1. Name: ada1
   Mediasize: 128035676160 (119G)
   Sectorsize: 512
   Mode: r1w1e2
   descr: MTFDDAK128MAM-1J1
   lunid: 500a0751039d7440
   ident: 1405039D7440
   rotationrate: 0
   fwsectors: 63
   fwheads: 16


------------------------------------------------


zpool status
  pool: zroot
state: ONLINE
  scan: scrub repaired 0 in 0 days 01:43:28 with 0 errors on Thu Mar 18 01:57:21 2021
config:

        NAME        STATE     READ WRITE CKSUM
        zroot       ONLINE       0     0     0
          raidz1-0  ONLINE       0     0     0
            ada4p3  ONLINE       0     0     0
            ada5p3  ONLINE       0     0     0
            ada6p3  ONLINE       0     0     0
            ada7p3  ONLINE       0     0     0
          raidz1-2  ONLINE       0     0     0
            ada0    ONLINE       0     0     0
            ada2    ONLINE       0     0     0
            ada3    ONLINE       0     0     0
            ada8    ONLINE       0     0     0
        logs
          nvd0p2    ONLINE       0     0     0
        cache
          nvd0p1    ONLINE       0     0     0

errors: No known data errors


-----------------------------------------------------
I found some information at manpages for ZFS and,

https://docs.oracle.com/cd/E18752_01/html/819-5461/gbchx.html
https://docs.oracle.com/cd/E19253-01/819-5461/gbiqe/index.html

And these are my questions:

About zfs administration, and snapshots, where can I found more information?

I did this snapshot

zfs list -t snapshot
NAME                 USED  AVAIL  REFER  MOUNTPOINT
zroot/Dom at 03252021  32.6G      -   353G  -

And interested on:

Doing a zfs send to file  as this, may I delete snapshjot from my zpool and then restore it using zfs receiver?
zfs send zroot/Dom at 03252021 | gzip > /mnt/bkp/march2021.gz

I will be appreciate any advise,

Serguei Esquivel