regardless of original or copied files as long as 100 % downloaded…
you can delete w/c ever you want to reduce disk capacity...
to seed, download [torrent] and point and locate the exact name/folder/files/location to your hard drive where ever you keep them…
[if you rename the torrent file/folder...copy and locate the torrent name and rename the exact copy of torrent file that you own...
once force re-check started you can see the progress of the torrent if the file is right...
Good Luck !!!