Oh another thing that chews up space is thoughtlessly adding or misusing a set of audit columns to every single table regardless of how the table is used. For example, if a table only allows inserts in a version type approach, there is no reason to add columns that capture UpdateDate and/or UpdateUserID. If a table's use case(s) calls for a row to be updated, only then are the Update fields necessary.

And please think twice before setting the CreateDate and the UpdateDate to the same exact value on insert: this a clear violation of the limited redundancy principle. If 90% or more of the columns are never updated, then there will be an extraneous 8 bytes on each row from the UpdateDate; multiply that by the number of rows where it should be null and in every table where it is misused, then the numbers get quite large quite quickly.