Thank you for
reaching out on the community and telling us about your issue. There's a couple of ways to move your file from copy/pasting it or drag and dropping it into the correct area. I'll link a 3rd party article on how to do so below for windows.https://www.howtogeek.com/667029/how-to-copy-or-move-files-and-folders-in-windows-10/
As for where you want to move it, if you want to put it in the default quicken area that should be under C:\Users\<username>\Documents\Quicken You'll want to move the file in there. Once you do move it as well make sure you double click on the file to open it as quicken will try opening the file from an invalid location.Last thing here are you getting an error when backing up? If so what's the error reading? Using a cloud storage sometimes can pop up errors while trying to create one so there's a chance once we move it it could resolve itself.
Once you get a chance let us know an update!
So move datafile 1st, create shortcut to it, and open it that way.