I have a question about the way Time Machine puts files on an external hard drive. I have been using it for a couple months and I am just curious how it work out of interest (nothing is wrong). When I look through my external drive in which Time Machine backs up to, I see all the files under the various times and dates that Time Machine saved them to. But I thought it only did incremental backups? As in, it only backs up things that have changed? It seems as if it's got all the full files in each different backup dated folder. So I am just curious how it works.