davidrb wrote:
I am looking for advice on how this is done. I used to be able to drag the new file onto the old (back-up version) and let file management do its thing. I just tired doing this and got a dialogue box telling me it wanted to add the entire file as new, and it needed additional space. I must have missed something but can't figure out what. Any assistance will be appreciated.
Backing up to an external drive is just an everyday event for most of us. You need to get a backup program. There are lots of them out there. This will only write files that have changed. You shouldn’t be doing this drag and drop style. I use carbon copy cloner. Quick and easy. I’m backing up something pretty much every day.