How do you feel about storing user data?

In this era of "SaaS", if you want to make a useful app you'll probably need to store all of your users' data on your servers / in your DB which has it's advantages and disadvantages. Back when most people installed apps and saved their data locally on their own computer, developers didn't have to think about being "web scale" and handling the load of all of their users data but also didn't get the benefits that come with the "cloud".

E.g.: Microsoft Word didn't need any servers but your documents were stuck on one machine, while Google Docs can be used anywhere but has full control of their users data.

How do you feel about storing all of your users' data?

Edit: Grammer

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