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udev-trigger-zfs-autobackup
Automatically snapshot and sync ZFS datasets when backup disk is attached.
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zfs_autobackup
ZFS autobackup is used to periodicly backup ZFS filesystems to other locations. Easy to use and very reliable.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Yes it's good practice to backup your data to external disks. Google the 3-2-1 rule. A zfs mirror or raid is not really a backup, it improves availability. To make your life easier you can use replication tasks, rsync, zfs-autobackup (and even trigger it with a script when plugging the external disk in with https://github.com/ghan1t/udev-trigger-zfs-autobackup)
I recommend you to get familiar with https://github.com/psy0rz/zfs_autobackup/wiki first and then use the configuration you are happy with in my script.