Store Your Files on This NAS
If you have another person in your office, you need to share your files. Store them on this. Backup your NAS with Dropbox or Backblaze B2. Why a NAS rather than relying on Dropbox directly? Because you need a copy of all your files where you can see and control them. These files are your work - you should control them as well as you can. The flexibility of having everything on Dropbox is a real boon to workflows, and it keeps a backup copy of everything online as well. Dropbox is the most reliable online service useful for architecture since it can upload just changes in large files (very useful for frequent saves to large files).
Synology Disktation 420+
Populate this NAS with two or four Western Digital Red or Seagate IronWolf drives in the capacity you need. If you’re not sure, start with two 6TB drives and set them to RAID-1 when you set it up. Log into your dropbox account on the NAS and use the NAS as a local high performance copy of your Dropbox folder. You can add two more drives later and double your storage.
You should also attach an external hard drive (6TB USB Drive) for regular local backups, which can be scheduled on the system.
$500 from B&H
2x 6TB Drives $320 From B&H