Board Thread:The Quarters - Q & A/@comment-219.89.192.44-20140307021825/@comment-5379369-20140307040250

If you subscribe, HabitRPG retains "full history entries", but that seems more applicable to habit tracking data.

Given the phrase "Completed To-Dos are automatically archived after 3 days. You can access them from Options > Settings > Data Export.", TODO's should be kept around, but perhaps there is a bug related to it. You could try commenting on or submitting a bug report on the | GitHub if a relevant one does not exist.