Report Retro 5 under OSX -- 2G catalog file error? HELP! in Retrospect 6: Desktop, Workgroup and Server for Mac OS X Posted October 2, 2002 Hi, Sorry I misunderstood your initial post! Here's some information from our developers: Macintosh chunk files (upon which catalogs are based) are limited to 2GB. This was the design specification for chunk files initially. The Windows product uses a newer version of chunk files that works with truly gargantuan amounts of data. You should be able to nearly double the capacity of your catalogs by turning on catalog compression in backup set properties. Since compressed chunks are 30-50% of the original size then more of them fit into the 2GB space available.