Using ZFS to achieve 3-2-1 backups and bitrot protection on limited hardware ...by Sean Twiehaus
I'm gearing this talk towards homelab users. The premise will be: "I have some documents (taxes, copies of drivers licenses, marriage certificate etc.) that contain too much Personally Identifiable Information (PII) to upload to Google or Dropbox. How can I keep these documents backed up and secured using minimal hardware that I may already have laying around?

I'll show how I'm achieving 3-2-1 Backups using an ODROID H3+ w zfs_autobackup & Restic (links to each below).

The bulk of this presentation will be me explaining the ZFS setup that I described in this forum post:
[https://discourse.practicalzfs.com/t/snapshots-to-a-different-zpool-on-the-same-host-as-part-of-a-3-2-1-backup-strategy/1074](https://www.google.com/url?q=https://discourse.practicalzfs.com/t/snapshots-to-a-different-zpool-on-the-same-host-as-part-of-a-3-2-1-backup-strategy/1074&sa=D&source=calendar&usd=2&usg=AOvVaw3eqh6AUsB17Ns6mw2yyVLe)

Basically, I have an ODROID H3+ that has multiple drives attached. I configure them to have multiple zpools. I then take snapshots of one zpool and send it to another zpool on the same host. This gives me two copies of the data on two different storage devices. Then I use restic to send a third copy offsite. I also use some nifty ZFS features to enable bitrot protection on a single device zpool.

ODROID H3+: [https://www.hardkernel.com/shop/odroid-h3-plus/](https://www.google.com/url?q=https://www.hardkernel.com/shop/odroid-h3-plus/&sa=D&source=calendar&usd=2&usg=AOvVaw2hHcwbOtn2KT2NKup2GKjV)
3-2-1 Backups: [https://www.seagate.com/blog/what-is-a-3-2-1-backup-strategy/](https://www.google.com/url?q=https://www.seagate.com/blog/what-is-a-3-2-1-backup-strategy/&sa=D&source=calendar&usd=2&usg=AOvVaw2vrjdN9azzPX07LKaVvgTG)
zfs_autobackup: [https://github.com/psy0rz/zfs_autobackup](https://www.google.com/url?q=https://github.com/psy0rz/zfs_autobackup&sa=D&source=calendar&usd=2&usg=AOvVaw058n9MP5-ap4JJg3b2UJXP)
Restic: [https://restic.net/](https://www.google.com/url?q=https://restic.net/&sa=D&source=calendar&usd=2&usg=AOvVaw29y9UEZe_AD4R2zk55hJgM)

(Editor's note: A Copy-On-Write (COW) FS, the ZFS file system was part of Sun's Solaris OS. OpenSource from 2005 thru 2010, Oracle made it ClosedSource after Oracle Inc bought Sun Inc in 2010(?). It took until 2013 for Oracle to make it OpenSource again. During the wait BTRfs stole alot of its ideas and proponents. Now, Sean will bring us up to date on the latest. OpenZFS also runs on Linux & BSD (including MacOS).)