Have you used sanoid/syncoid? I started my ZFS journey with a custom script and then switched to syncoid/sanoid (and some much simplified scripts) for my backup needs. One of my use cases is for Raspberry Pis which seem to have a habit of becoming unbootable. These are Pi 4Bs running from SATA/USB SSD or CM4s using NVME SSDs. I have scripts that use

* dd to copy the boot sector (to a ZFS filesystem) * rsync to copy the boot (FAT32) and root (EXT4) partitions (also to a ZFS filesystem) * syncoid to copy the ZFS filesystem to another host.

This process runs daily. When a system craps, it's pretty straightforward to restore the boot sector and boot and root partitions and finally the ZFS pool.

I'm curious zrepl does that might be useful for me.