Specific Type Of Backup?

Hey everyone! Every time I try to backup everything on my HDD to an external HDD, instead of new files being copied each time, EVERYTHING gets backed up. I was wondering if there was a type of backup/software which would allow me to ONLY backup new files, instead of backing up everything, including stuff that has already been backed up. 

 

Thanks to whoever can help, and hopefully I made sense!

The key term you will be looking for when researching a product is "Incremental backup"

Awesome, thanks! I just installed Cobian Backup since it has that feature and many others, and I love it! 

if you really want a solution just have a look at the "Cloudbacko pro software" I am sure it will definaltely help you. i am leaving a link with this comment just go through it and have a try. as they are giving 30 days free trial period.