Anyone out there using BagIt? I need help please

I’ve installed the Bagit Plugin and managed to get it to create a bag - but when I unzip and look at the bag the data directory contains no data. I’m not entirely sure I understand the concept of BagIt and can’t find any documentation (aimed at a relative beginner) to help be solve the problem.

Please can anyone help - or point me in the direction of someone who can?