Your remotely stored or created documents may be subject to subpoena without your knowledge. Saw this article by Mark Rasch @ Security Focus.

Here's a quote:

Whenever records or other evidence is housed with a third party, you have not only increased the likelihood of data access, you have created a new entity with physical or logical possession of your records. Who "owns" your records? Who has a right to access them? Who has "possession" of them? Who has "control" over them? Who must produce them if there is a subpoena, search warrant or other court order? Suffice it to say, when you lose "possession" of the documents, you lose control over what happens to them.

Don't Be Evil