FastClose keeps a copy of previous version of a report so that you can go back to an older version if you wish.
The comments field in the "Save" dialog allows you to add information which can make this process easier to.
To open an older version, open the "Home" dialog, navigate to the item of interest, right click and select "View History"
Select the vearsion you want to see:
and click on "Open Selected Version".
Once opened, the report tab includes the version number opened and the date and time that version was created.
NB: Opening an older version does not replace the existing one. If you wish to go back to the earlier version, you must open the older version and then save it using the oroiginal name.