NAS with Dropbox backup

We currently have a small workgroup homeoffice with 3 people. We are realtors and store vids and pictures along with documents for clients. I am estimating requirement of 30TB for 5 years. We have macs with imacs with Thunderbolt 1, 2 and windows laptops. but are in the market for new desktop with Thunderbolt 3. Most of our network is 1Gbe or wifi on 150Mb internet. We have been using Dropbox as our storage and would like the ultimate solution to be storage locally in the high speed NAS but automatically backed up to Dropbox. Is there a NAS/software that can do that in the background automatically.
We have tried just cut and paste files using Dropbox Sync to upload and it is quite unreliable. Some files mysteriously just don’t get copied and I have the tough job of figuring out which files worked.

I would recommend to replace Dropbox with Synology Drive app or Qnap sync and having all your data on a NAS backed up to BlackBlaze (unlimited online storage very cheap). The Drive app will do exactly the same thing what dropbox do, but files will be synchronized with a NAS. It also has version control built in just like Dropbox. Any file or folder can be shared locally or over the internet if you need to work with clients.

If you still prefer Dropbox to synchronize any folder on a NAS- bot Synology and Qnap do have this functionality allowing this to be run in the background. If you need something to last next 5 years, I suggest TS-653B or DS1618+. Both NAS will allow 10GbE upgrade later, as this will become standard very very soon. Also, DS1618+ comes with 4 LAN ports maximizing performance within your existing Gigabit network.

Products from Amazon.com

If you prefer to have thunderbolt3 connectivity as well as NAS function, you can have a look at xTB3 models from Qnap.

 

For backing up your NAS do consider BlackBlaze. You can try it for 15 days free if you don't believe its good. But the main reason is unlimited backup size. Everyone else like Dropbox, Amazon, and others charge per gigabyte. But  with this one there is no price difference either you backup 2 bay or 8 bay NAS. The other great feature is version control. So even if you get hit by ransomware type of virus or simply deleted or mistakenly changed few files. You can restore your data from historical backup versions and get all data back.
You can get it for free here and try:
Home: https://www.backblaze.com/cloud-backup.html#af9rgr
Businesshttps://www.backblaze.com/business-backup.html#af9rgr
Comparison with other service providers: https://www.backblaze.com/best-online-backup-service.html#af9rgr
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10GbE iMac Pro with fastest NAS