Specify the compression level to use.

Syntax:

TCompressLevel = 0..9;
property CompressLevel: TCompressLevel;

Description:

Zero means no compression. For the custom archive format, this specifies compression of individual table-data segments, and the default is to compress at a moderate level. For plain text output, setting a nonzero compression level causes the entire output file to be compressed, as though it had been fed through gzip;

The tar archive format currently does not support compression at all.