The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
Fast contact backup is application to backup your contacts of iPhone/iPad on your email. So You dont need to use Computer to backup/Restore contact. You Just need to take backup contacts using application send email you your self and later on restore contacts.