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Our district offers each teacher space on district servers, but teachers who are heavy users and develop and save flipcharts all year long often eventually max out that space.
I've seen teachers who have carried around several color-coded flashdrives each filled with flipcharts or purchased external hard drives to hold all their flipcharts. Of course issues arise when you don't have the equipment on hand or the hardware is misplaced or fails.
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Teachers always need to be aware of the information they put online, but the vast majority of the flipcharts I own don't contain any specific user information, so I'll enjoy having my flipcharts in one spot.
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The one drawback I can see in my plan is that I am at the mercy of my Internet connection and Promethean Planet's site, but the lure of 1 GB of storage is enough to get my attention. And as teachers who use Promethean Planet plan and prepare for the next school year, I'll encourage them to look into this free storage option.