10. The method of claim 1 wherein the client database includes a plurality of client documents, the method further comprising designating for deletion one of the client documents based on a document score of a complementary document in the server database.
10. The method of claim 1 wherein the client database includes a plurality of client documents, the method further comprising designating for deletion one of the client documents based on a document score of a complementary document in the server database. 12. The method of claim 10 further comprising increasing a data storage capacity of the client by deleting the one of the client documents designated for deletion.