No you are right, the m720q will fit an 2.5” and also m.2 drives.

Sorry, what I meant is that they will not fit 3,5” hdds, let alone multiple ones.

12th Gen is definitively neat, but overkill for what you are doing. 8th or 9th gen is fine. 16gigs is fine, 8gig would also work

I really like the Lenovo m720q line of mini pcs (used/refurb) but they will not fit an hdd.

/edit: I mean an 3,5” HDD. They will fit one 2,5” HDD fine.