FTP servers do not support a Copy command. If you try to Copy then Paste an item from one remote folder to another, the item will simply move to the new location on the server. You can Cut and Paste the file back if you need to restore the original file. This is a limitation of the FTP protocol.
You can use Copy and Paste to copy files from a remote site to a local folder, from a local folder to a remote folder, or from one local folder to another local folder.
To copy and paste items from one remote folder to another remote folder
Connect to an FTP site.
Download the item you want to copy.
Open the folder on the remote site where you want a copy of the item.
Upload the item to the new folder.