(1) You must use “Email Backup” wizard to back up Outlook emails. This is because when you are using Outlook, the Outlook PST files are always locked. So it needs special method to backup it.
(2) You cannot restore Outlook Backup when Outlook is open because the PST files are locked by Outlook.
(3) If you have small amount of data, the restore can be very fast. DriveHQ Online Backup automatically skips downloading / uploading the same files if they already exists.
Please try to restore the files to another folder and see how it goes.