How all-in-one are you looking to get? And how much IT knowledge/staff do you have? Also what is the budget?
Discussion
Budget-wise, upgrading from 5tb to 10tb with Google would cost us $840/year. So anything that would give us a 2-3 year return on investment would be within budget. Meaning, up to $2,500.
As long as uploading files to the cloud isn't too complicated, my staff could manage. There are 5 of us full-time and 8 part-timers. Approximately up to 15 people would need to be able to upload files to the storage.
As for our clients, we would need approximately 100 people having the ability to access their individual folders, containing videos and written reports.
That is very doable. Good budget. You’ll be fine to selfhost. Proxmox on a desktop you build is the best all around solution imo.
Here’s roughly mine, I think the ram I selected is different: https://pcpartpicker.com/list/8gDH9c
Oh and this is the case it’s in: https://www.amazon.com/AUDHEID-Enclosures-Compatible-Micro-ATX-Motherboard/dp/B09QKMQ1B1
Oh wait, I have 5 4tb evos.