This question has been answered by BobRay. See the first response.
I get the locked icon for .htaccess, but I'm still able to edit and save it in the Manager. I think I was also able to copy it, but I might mistaken.
If you have cPanel access, you should be able to do anything you want there. You might also be able to use FTP to download the file, copy it to another file and upload that as a backup. Then you could edit the original locally and upload it.