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Some USB drives, forĮxample, take some time to mount before your computer recognizes them. If you are not currently signed in to your Dropbox account, simply enter your Dropbox credentials, and click on the Sign in button, then you will be asked to. Your Dropbox folder must be available when your computer boots andīefore the Dropbox desktop application starts. You may encounter problems if Dropbox occasionally can't access the detached volume holding its folder, however.
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That said, you can change the location of the Dropbox folder away from its default of ~/Dropbox, so if you have a separate internal or external disk you could put the Dropbox folder there. As far as I'm aware, you can't mount your Dropbox account as some sort of remote file share - its synced files are always written to your local disk. Navigate to your Dropbox folder and find the 'Quicken Backup Files' folder you created in step 1 and click Choose.
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Update: See nassimhddd's answer below about ExpanDrive allowing you to mount your DropBox account as (external) drive - since Next to File backup, check the Automatically back up data file when quitting Quicken checkbox.
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