In project management it´s very important the possibility to save a baseline, because is the reference to compare project performance. 
Something like "save current task list with a specific name, sample: baseline_first-planning-date". 
After sometime it´s possible to save new baseline with all changes of dates and other columns. 
At this moment with two baselines it´s possible to compare the project performance, showing two gantt with different colors. 
I believe this is a great improvement. 
Thanks
Daniel