Duplicating multiple files created by Clonezilla

I used to open the directory with 'open as administrator' and use the 'copy' command. It no lnger works. How do I copy multiple Clonezilla back up files now?

I use Clonezilla and do the same, open a window as administrator and copy the backup directory that Clonezilla created to another drive. You need to have administrative rights in the window/directory you are copying to as well.

So far understood I think. But 18.04 will not allow me to open a second administrator window [administrator on drop down menu not there. [copying to USB external drive]

Can you use the same window. Open window as administrator, copy directory. Then within the same window navigate to your source drive (USB external drive) and paste.