ALZ file is an ALZip Archive. The ALZ is a mainly Korean archive format from ESTsoft specially designed for very large archives. There is no size limit on an ALZ archive like there is for ZIP files. So you can backup storage intensive files like raw video footage.
http://www.altools.com/Downloads.aspx
Fonti:
http://www.filedesc.com/file/alz.html
http://en.wikipedia.org/wiki/List_of_archive_formats
http://en.wikipedia.org/wiki/ALZip
