OH OH OH I've been saying that Bruce has held onto his beaten up, duct taped laptop from home and powering it with a little mini solar generator he cobbled together this is the part where you tell me I can't do that BUT IF I CAN, I presume he's keeping his data on there since the power's all fritzy?

He probably keeps it on him neurotically most of the time, so it'd be pretty tough to sneak in and get it without him noticing. To try to provide a plausible reason why Bats would get caught.