Traces or redirectors are good.
A redirector is a bread crumb left behind that tells the editor where the asset was moved from folder A to folder B. The reason for this is so that if an asset package that shares the same resources is added will be able to find the asset share in the new folder with out having to duplicate.
Fix Redirectors does that in it bakes or fix the link to the proper address but once done assets shares will duplicate once imported so no harm done if you reconnect by hand.