Using Acronis True Image Home version 11, backing up to an external drive; running daily differential backups. My questions involve the file names and how to identify the full backup. The files with the earliest date must be the full backup, but they are about the same size as the subsequent differential backups. Is that to be expected? There are 7 files with the earliest date (modified times range from 5:05pm to 5:27pm). The files are all named MyBackup(1)1.tib, MyBackup(1)2.tib, MyBackup(1)3.tib, and so on. The first six files are all the same size, with the seventh file being somewhat smaller. Do all seven of these files constitute "the full backup"? Why are there six files of exactly the same size? And why are there multiple files, instead of a single full backup file? Each day's differential backup can be a single file or several files -- sometimes as many as six files for one day. Why is this? The most common pattern seems to be three files for one day's differential backup, with the first two being exactly the same size and the third file being much smaller. Does any of this indicate I've set the program up wrong? Does TI automatically create duplicate files (but there are days when only a single file is created)? What is the smaller file (always the last file created)? Another mystery is why the earlier differential backup files are numbered 81, 82, 83, and so on, then after the first few days, start being numbered 810, 811, 812, and so on. Why did the naming of these files change? And can someone please confirm that, in order to free up space on the drive, I can delete all the files between the original full backup files and the most recent set of differential backup files? Thank you.