>>/46314/
 >>/46395/
Progress update:

 Older 

Syncing crappy NTFS HDD to ZFS HDD:
. (static) ponibooru.org - 224 GB
. (static) foalcon.com - 68 GB
. twibooru.org - 4.2 TB

On better storage:
. (static) bronibooru.com - 228 GB
. (static) pbooru.com - 900 GB warc
. (static) twentypercentcooler.net - ~700 GB
. (static) www.anonpone.com - ~86 GB warc + ~10 GB raws if you want them
. (static) archive.heinessen.com/mlp/ - 222 GB
. (static) Everfree_Radio_RIP, "My Little Pony"-related music - 60 GB
. (static) G1 MLP disc ISO files - ~32 GB
. (static) G4 MLP disc ISO files, S1-S4 - 104.5 GiB
. (static) MLP EQG disc ISO files, DVD&BD - 65.9 GiB
. (static) My Little Karaoke disc ISO files - 10.5 GiB
. (static) G4 MLP AI Dub, EP 1&2 + MLP Antithology 1 - 2 GiB
. (static) MD5+SHA1 hashes of 60M+ files (MLP and furry related) - 32.6 GiB
. (probably static) poneb.in - 1.2 GB
. clop.booru.org and g.booru.org - 30 GB
. smutty.horse - ~260 GB
. some furry websites which you said you wanted
. etc.

Total (probably forget some things): 7.237 TB

 Newer 

. (static) pbooru.com - 223 GB raws
. various MLP-related website WARCs - 5 TB + >100 GB of related data
. various MLP fan fiction data - ~300 GB
. Pony Music Archive (PMA) torrents, more to dl - 1 TB
. etc.

Older + Newer total, roughly: 13.86 TB