So I recently set up Time Machine with my Macbook Pro and my trusty external harddrive but was a bit confused about how the backups are working. With a laptop I really don't want to be tethered to the wall plugged into my external drive all the time. Will Time Machine run a backup every time I plug in the external drive (assuming things have been modified)? That seems like the most ideal way to do it, when things have been changed, just plug it in, let it backup stuff quick and unplug it. I've looked all around and can't find a clear answer to this question. Thanks for the help and sorry if it's already been addressed.