Synchronize tool

From the day when I start having an habit of keeping backup files on to both my Pen drive and External hard drive (as per my lecture advice).. I always do copy & paste of the files... Simple procedure that any novice will do like me... Sometimes, by mistake it happens that I forgot to copy some of the least important files to my backup devices... and in case when I need that any time later.. I usually end up searching all my three devices (Laptop Hard disk, pen drive & external hard disk) to find the one... I was following this procedure until recently my friend Felix has told me about the "Microsoft Sync Toy" tool.. it is awesome... very simple and easy to use.. no need to read any instruction for using this file... we just need to select the left and right side folders.. and the choosing the option for how we want to synchronize... i.e., either on both side or only on one side... rest the software takes care of everything what we want to achieve... Simple but very powerful tool... If you haven't tried this yet.. then you could probably want to do that now.... ;-)