What is the difference between MS Windows 7 Backup and MS Synctoy? I am using Windows 7 Backup and only back up the four Libraries and some additional locations off of the C: drive totalling about 45 GB and Windows7 Backup now requires 151 GB of disk space on my external hard drive which only has 70 GB remaining on a 250 GB hard drive.. I think W7 Backup up creates zip files, but it seems like it uses a lot of space otherwise. I am deciding whether to buy a larger (1 TB) external hard drive and continue backup or to start copying the libraries one at a time. Thanks for opinions.