Backup only changed files?

I am looking at moving all my backups to Azure, I have set up my first job to back up the 90GB of data from my web server.

Am I correct in thinking that the job i have scheduled to run every day will back it ALL up everyday?

Is there a way I could say run a FULL backup once a week but then everyday only backup files that have changed from the previous day?

This would speed up my backups, use less space and cost less money?

Thanks