Dropbox doesn’t allow deleting folders from a Dropbox account and simultaneously keeping them on local computer storage. The two folders synchronize automatically and removing any files from a Dropbox account will also remove them from local computer storage. However, there is a workaround. To preserve a file on your computer after deleting it online, simply move it from the local Dropbox folder to another folder on your computer. You can move it to My Documents, Desktop, or anywhere else. Once you do, you can delete the folder from your Dropbox account without losing the files on your computer.