Will the software support conversion of .snb files from Samsung Galaxy so I can open them on Mac?
No, the application won't work for your needs, but there is a simple trick to open the contents. Simply rename the SNB file extension to ZIP then use any compatible archiver application to extract it. This solution has been pointed on the XDA Developers forum where other users posted the same question in relation to the SNB file conversion or opening.
XDA Developers: http://forum.xda-developers.com/showthread.php?t=1907192