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.