Your backup will update automatically every hour while your external hard drive is plugged in. If you’d like to make changes to these files, make them directly to the files on your external hard drive. Note: You can’t make changes (like editing, adding, or moving) to files backed up from an external hard drive in Dropbox. Once you plug in your external hard drive and agree to back it up, your files will get backed up to Dropbox Backup.Īfter your external hard drive files are backed up, you can access them from /backup/all.