I just bought My Book Essential and successfully backed up my hard drive. Now, here is my question-
I want to delete files of my computer hard drive (like 4 years of photos) in hopes that the computer will start running faster. The photos are on my My Book. If I delete them off the computer and then do another backup next month will the new backup detect that the files are gone and delete them of the external drive?
In other words - does running an additional backup just add files to the the external drive or does it take off delete files to match what the hard drive looks like now?