@Armando - not to mention it was made in Canada 
@mouser - done - https://www.donation...ex.php?topic=24261.0
@MerleOne - have a look here, let me know what you think - http://www.bvckup.co...opic_show.pl?pid=258
-apankrat
Thanks for making the link with my other post ! I guess I missed you answer on your forum. I think my preference would go to a special folder containing previous revisions, some kind of archive folder. But it would be great if you could use, as an option, winrar solid archive to store revisions of a same file. Solid archiving (in winrar) is then deadly space-efficient (while taking some more time). What I am concerned about is the space taken.
For instance, when I edit a big excel file, I save it each time I make a critical change, this can be 10-20 times per day, sometimes even more. If the file is 4 MB big, without a clever way to handle the versions, it would take a huge space on my HDD.
Also, the next step would also be to manage those revisions, purge them at times; either manually or with a specific setting.