>>10233
>>10234
More lessons to be learned:
(a.) 3 copies of something is better than 1, so "always" have at least 2 copies of something.
(b.) If there is a delay between creating at least one backup copy of something, then you might end up screwed.

For (a): even went deleting /z9/youtube after copying it to another HDD, I was thinking that might not be the right move (less able to operate locklessly and stuff). I could have kept the 2 copies, then when the 3 copy was created: then and only then I could have deleted 1 of them.

For (b): I was more focused on adding stuff to zb and less focused on getting backups of stuff on there. For reasons stated above, I didn't think zb would crap out on me after only about 30 days of being powered on. Also, I thought of zb as being used as a backup HDD itself instead of having lots of exclusive data.

As usual, before deleting >300 GB folder "/z9/youtube" I created an index of it. Here that is (I'm now using grab-site to check which of the >5000 YT video IDs are 404 or not):
https://gateway.pinata.cloud/ipfs/QmWRGneJM4YkKWdnofZGyzWHxHrjQdSyHjHw78YrTHwpPU

Update: checked those IDs at id/maxres.jpg">https://iv.ggtyler.dev/viid/maxres.jpg = none not already noted are 404'd. Just gotta re-download that specific 334 gigabytes from youtube.com :/

Trying to undelete a file in ZFS? You're out of luck. Some links:
. This software didn't work for me https://unix.stackexchange.com/questions/611303/does-anyone-know-the-way-to-undelete-file-on-zfs