6.0

2.3 Compression Level
In the next Compression level window youll need to select a data
compression level of a partition image. A compression level can be selected
by moving the slider. If you select zero compression, files will be obviously
moved to an archive file without any compression, which is inefficient. On
the other hand the work speed might drop and image creation time might
increase, if you select the maximal compression. Certainly, the optimal
compression level depends on the type of files, stored on a disk/partition,
and can only be determined empirically.
Image’s data compression level
Acronis TrueImage 13