Add option to disable compression of backup
We intend to use zbackup as a backup solution. If used properly zbackup can deduplicate data as well as compress and optionally encrypt the resulting file. This of course only works well if the files added to the backup volume don't change to much. The compression inside the backup tarball makes this less efficient and overall increases the file size of our backup history a lot.
Add an option to disable the piping of the files inside the tarball through gzip, pigz or the like.