Yup. I’ve worked in big multinational companies where a local department would roll their own solution (a database and a web page, usually), and then the people that built it moved on or retired and now no one will maintain the thing. A small business has much less resources to deal with this kind of thing.

The closer the stuff is to off the shelf, the better. Reliability and maintainability are paramount and should trump feature set when deciding.

Infrastructure is also easier to change. A TrueNAS local server with external backup using Borg should be a no brainer for users. You could also setup Syncthing to get users something close to OneDrive.

If the business grows tenfold, it’s still only 120 people. They can’t handle that in a gaming rig?