So, I just set up a new hard drive to do Time Machine backups of my laptop. It has been running for a very long time, but the back up is almost 600 GB, so I guess that's not unreasonable. However, Time Machine is set to back up every hour! My question is, is each Time Machine back up going to be nearly 600GB?! After 5 hours, my 3 TB hard drive will be full. And it can't possibly back up each hour because this back up is taking hours. I'm hoping that the reason it's taking so long is that it is a very large back up, but that each subsequent back up will be relatively fast since it will only note the differences between back ups?