Hi Using true image 11 here. Doing something really simple. Backup the computer to an external HD and then do differential backups every day. Now the first full back up was 27Gb which is ok since it is a bout the size of my hard drive (HD of computer not external external one) But each differential backup is about the same size. Why is that? they should be small.... Now i got 6 archive files and they pretty much already fill up my entire external HD.... i don't get this application.... I read a lot of posts of people being equally confused with the inner workings of true image which is not doing what it should do. could you explain why my differential archive files are as big as the full backup file? thanks.