Provide a way for residents to back up important aspects of their inventory as a fallback / failsafe to recover in case of inventory loses. In addition, provide an offline archive and respository to make it easy to prune older inventory items, but recover and activate them at a future date. Essential feature: retain folder structures correctly throughout. (The boxing technique for storing items long term does not retain folder structures, making it effectively useless). You could provide both features as perks for Premium membership. You could charge for larger archives or backups, as a way of funding these features.