What you could do instead is write down idiot proof guides on how to access things from mac and windows, write down passwords, tell them how to access ntfs from Mac and vice versa etc.

It’s what I’m doing. Only bad thing is that you have to update it every once in a a while because things change.

How much TB do you actually need? Such a long post…

I like synology for simplicity. And because I believe it‘s hard to get proper alternatives for synology drive and photos