I really need to get back into this thread.

 >>/9655/ 
> BestBuy... I think it was like 26 USD per terabyte for a 5TB external HDD. It was approximately 19 USD per terabyte for an 18TB external HDD. (External HDDs between 5 and 18 TB = some price between those prices, but not much of a deal IIRC.) 

 I have previously seen some in the last couple years insist that hard drives above 2 to 4 TB were unreliable, but was uncertain on valid that is. Are you having them delivered? I also wonder if that also might have a impact on lifespan.I say this though as someone who has had used drives that were shipped on pretty poor conditions, from ebay,last years!

 >>/9656/
> "Long ago" I was operating data in a bad way (not very forward-thinking), though I did have good backups of some/most things, but not of all things, resulting in important stuff being lost.

This is probably me right now. It is a disorganized mishmash of old drives and handmedowns. Albeit I don't think all data needs to be backed up in a paranoid way. also,I am more drawn to BTFS and DragonflyBSD's Hammer2 than ZFS, which might be a sin in some circles.  Hardly messed with much out of ext4 and ext2... yes,I had some reasons to use ext2 in the modern day.

> Therefore, if I keep operating in a good way and keep paying for it. A tip: remember to have an offline "cold storage" local backup for all highly-used HDDs since that certainly warrants a backup; have local backups for everything else if you can. 

ZFS plus constant updates, yeah, I can see how that would kill a drive pretty quickly. 

> So, perhaps I can seed this until I die:

magnet:?xt=urn:btih:3850e42c8449a43e2959
> which is WARC: pbooru.com (897.92 GiB). Would be neat to get all torrents to a share ratio of 15 or more, which is what I try for on some or all of them. Maybe it'll take decades to share that pbooru.com torrent to a ratio of >10. 

How long have you had this WARC? Did you take it from when the backup site died?  I do know that ponybooru went through a instance or two of mostly abandoned backup sites but I know little details on that other than running into the last one and peaking in at the mess that was left.
 
> http://pbooru.com/ was an MLP booru (which was titled "PoniBooru" though not the original ponibooru.org). Pbooru had a great feature which basically all current pony boorus don't have, but unfortunately the software it was based on is closed source. Pbooru is dead, long live Pbooru! It's unique data lives on, and pretty much all current MLP boorus are Yet Another Philomena Clone (YAPC) boorus.

What was the feature? 

Also, twibooru is based on a heavily modified copy of derpibooru's old code base, booru on rails, last I heard floorb/not-twifag or whatever he calls himself practice extreme obscurantism (gropher.. the old rival to the world wide web as we know it, was involved) to with the availablity of the source code and wished to close source it (not sure if he ever did).   

 >>/9662/
Look forward to seeing it!