When the handset nears the limit set by the user a message appears on screen, and if the limit is reached the data function disables itself for the rest of the 30 day period.
Research shows that exercise can help to maintain physical function late in life and that exercising one's brain can limit the progression of senescence.
While the feature is in beta, there's also no limit to how much storage space you use up, and there's no auto-delete function after any amount of time, so feel free to upload to your heart's content.