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Would it not have been easier to just mount the destroyed old pool or recovering the dataset from the history ring buffer?

zpool import -D

https://openzfs.github.io/openzfs-docs/man/master/8/zpool-im...

I haven't tried this, but I gather from the blog post that it would have been much simpler as it didn't require any of the encryption stuff.

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There wasn't a destroyed pool, it's the harder version of trying to rewind time on the filesystem. It's worth trying once the disks are fully backed up, but it's fussy enough that I can understand why they made it plan B.

It didn't make the cut for the article, but I do recall trying to import older uberblocks still in the label ring buffer with zpool import -T at some point, but none were before the zfs destroy. I assume that was because TrueNAS logs to the .system dataset and presumably wrote through the entire ring buffer before I got to it.

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