Compression ratio
Setting for the compression for the value "Normal" for backup sets.

No compression for certain file types
Some file types (e.g. text files) can usually be compressed by 90% or more, while the typical compression ratio of other file types may be around 50% (e.g. executable files). If, however, you come across files for which no reasonably compression ratio can be achieved, these files usually already contain compressed data (e.g. MP3, ZIP, JPEG files). The time required by very large backups can be reduced significantly if the file types that should not be compressed are specified here. If, however, you set up a backup set to use "extreme compression", this list is ignored.

 Multi-Spanning user values
 You can enter two settings for multi-spanning on your hard disk. The size for archive parts is specified in KB and should be a multiple of 64 KB. The value should be between these minimum and maximum values:

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