Posted by watoosi:
4. What is the best way to automatically archive old tasks to a database or other searchable record?
A quick and dirty solution for this is to bookmark the "View Completed CSV" URL (from Import/Export Tools) and then use your browser's built-in find text on page feature (usually Ctrl-F). This is a very quick way to answer the "when did I last do this" kind of question.
Bookmark this:
https://www.toodledo.com/tools/csv.php?view=1;completed=1