Are we impeding the future by using electronic storage mechanisms?

We (the collective human race) are usually quite happy when we find written records from past civilizations. It helps us understand what was going on at the time and gives some insight into what the people were like. Even mundane things, such as shopping lists and receipts, can be exciting.

These days we mostly use electronic storage. It gets input on a computer and stored on a server somewhere. Eventually the data may be put on a “permanent” storage medium, such as tape or CD-ROM (or DVD, etc). However, these things are hardly permanent. Indeed, if there were some kind of disaster where an EMP pulse was sent out there’s a chance that a lot of this medium could get destroyed.
How much of a set back would it be for future archeologists if they couldn’t retrieve a lot of this information anymore? I guess encryption of data would also hinder these efforts.