With many good iOS games reaching 1GB+ in size, users are finding that they need to delete games more often. Craig Grannell points out the problem with that:

The only difference is that an iOS device can hold a bunch of ‘cartridges’, but when one’s removed, the result is the same: all your progress is lost.

This is a real problem and not just because of the size of the games themselves. When I go on trips I slim down my games and apps to maximize space for photos, videos, music on my iOS devices — I would love to have game progress backed up.