We are used to gathering data, businesses do and so do governments. This garbaged data is not much useful by itself but only by mining it with a specific focus – a purpose. This data is only useful if it is used and merely just collecting it does not make it any useful but might cost you hundred of thousands of dollar in storage costs.
So look at your systems. What data are you gathering and what can you use it for? Will you use it at all? How can this data help you serve customers better by creating an even better product? What is the expiry date of data that you are collecting?