Somewhat related: Tarsnap has a weird pricing scheme. You can follow the advice of patio11 in http://www.kalzumeus.com/2014/04/03/fantasy-tarsnap/ HN discussion https://news.ycombinator.com/item?id=7523953 (801 points, 1202 days ago, 311 comments) or you can follow the example of cperciva and ignore patio11.