@Alan Jazak wrote:
I DON'T want to hit "continue" because I fear it's going to start uploading my 2T of Dropbox to my not 2T of iMac. Is it a false fear? Is this what's going to happen? Is my computer going to suddenly fill up??
- finger poised over the Continue button.....
If you're running the Dropbox application on your Mac, then yes, the Dropbox folder will be moved to the Library/CloudStorage folder on your system drive so that it's in compliance with Apple's File Provider API. The Dropbox folder can no longer be store on an external or networked drive, not that NAS drives were ever supported in the first place.
If, however, you're not running the Dropbox application on your Mac and instead are relying on a third-party sync client directly on your NAS, then no, nothing will be moved as this only relates to the official Dropbox application. If you're running a Dropbox client on your NAS, it's likely created by the NAS company; not Dropbox.