We've always recommended making old employees inactive rather than deleting their user record. Deleting a user removes all of their timecard history, whereas making them inactive just removes the user name from any display groups they belong to. It's nice to have historic timecard data at your fingertips if you need it.
It's easy to view timecards for inactive employees. Turn on admin and select All Users from the display group popup menu in the bottom right corner of the Administration window. Now you can run a timecard for any past employee.
Technical Support Team
Redcort Software, Inc.