With out proper incentive users will have no reason to remove old useless data off the SAFE Network. This issue could be solved with recycling, similar to the recycling of raw materials user could be paid in Safecoin to remove unwanted data and free up resources for the SAFE Network. When a user puts x amount of data on the network, the network charges the user x Safecoins based on the network determined storage rate and when the user removes data off the network, the network rewards the user y Safecoins based on the network determined recycling rate.
Put x Data = 10 Safecoins
Rec x Data = 3 Safecoins