Design a small system that allows Yelp users to get all the data they provided on Yelp (Reviews, Photos,..etc).All data should be sent in a compressed file to their emails. The process of collecting the data and sending it doesn't have to be immediate(can take a couple of days). It's a feature that is already available on Yelp.

Any ideas? I couldn't think of a way to collect the data as they have different types.