Saving Report for Historical Use

As long as you don't hit Refresh on the report/dataset, then it will keep the historical data and not update. We do this in my organization at month end with one of the accounting datasets. It is downloaded and then republished with a new name and the new dataset is not given any gateways, so it could not possibly be refreshed. Then any users with access to the workspace can access the historical data in the report format. It is a very clunky solution, though, because you have multiple old datasets and reports cluttering up the workspace...it's the best we've found though.