Many use Microsoft Outlook and have their contacts in this piece of software but at the same time also have them in their smartphone and tablet and somehow end up with contacts all over the place and no real structure.
First thing you should do is export your contacts from Outlook to a CSV file
Now you will have a CSV file of your contacts from Outlook so the next step is to upload that file to contacts in Gmail which you can find by clicking the dropdown box to the right
Once uploaded to Google then find duplicates then sort out your contacts for items such as old information.
Now you have a copy of all your contacts , on the internet ( they are backed up ) and sorted via Google
More information can be found here