I estimate I have around $200 a month in EBS costs for volumes and their backups that need cleaning up, if I can get round to it. But there's just me in my startup, and I have no choice but to leave it lying around for the moment. But the lesson is that what I spend on that in a year (if I leave it that long) will pay for a temp resource for a month easily. That's a lot of harm things lying around can do to a cash strapped startup.