Highlight the recording or series of recordings you want to copy/move and press +
Highlight either copy or move and press ok.
Highlight the connected USB HDD you want to copy/move to and press OK.
To stop copy/move press + again.
To select multiple items in recordings list:
Highlight a programme then press + highlight select and press OK, you can now select multiple items by highlighting them and pressing OK.
Edit: To correct rubbish posted elsewhere, you can batch move series folders as you can individual programmes.
Important Note: Read This post re deleting timers.