TOSEC typically zips individual pieces (disks, tapes, cartridges etc.).
The folders themselves are not zipped.
Last TOSEC version is around 5.6TB.
But new TOSEC is coming.
I'm aware that the files are typically shared in zip format.
I wasn't sure if TOSEC counts them that way, given the wide variety of compression settings available.
The homepage says 6.89 TB.
So, an 8TB hard drive should be enough, for now. Although, I'm cutting it close.
Unzipped, I'm sure the actual size is closer to 14 TB, or more.
Thanks for the clarification, NLS.