G
Gene E. Bloch
[]Since I only do images (either full or incremental), I don't need to do
When you say image, I take it you mean a file-by-file image, not a
sector-by-sector one: I can't imagine what an incremental
sector-by-sector image would mean.[/QUOTE]
Haven't we been here before?
An image starts out as a single file containing the entire contents of a
partition or disk (at the use's choice), in a format proprietary to the
program that made it. It might also be compressed, so that it is smaller
than the source drive. It is a *representation* of the complete
drive/partition, including system files and the file system structure,
even the boot information. The program can restore this to a drive,
resulting in an exact copy of the original system.
An incremental image backup is an *additional* file containing all the
changes made since the last previous image.
Besides the copies of the new or changed files from the source disk,
each of these image files contains enough additional information so that
the set of image files from the first image up to & including a given
image file constitutes an exact representation of the contents of the
partition or drive at the time of the backup corresponding to that given
image file. The program can restore this to a drive, resulting in an
exact copy of the original system at the time of that backup.
A differential backup is similar except that only the first and one
given differential image file are need to create a reconstruction of the
disk at the time of the backup corresponding to that given image file.