I’ve tried Mionet which occasionally works, though it isn’t brilliant. I understand that a USB drive connected to an Apple
Airport Extreme can be accessed remotely using Back to My Mac, but I wonder whether accessing the MBL would be possible. I’m unable to add it to my list of file sharing networks/drives - it is greyed out. I wonder if this is because I only have access as a Guest? Or whether B2MM is limited to external USB drives only. Which would be a pity.