ns_Version is a python script that allows you to versioning your scene related data. That includes the XSI scene itself, renderpictures, captures & ICE caches. You can organize it with a bunch of subfolder possibilities which placed it in the common XSI scenefolder structure. There are also some handy tools/scripts included.
Install the ns_Version_v052.xsiaddon in your favourite workgroup.
Install the ns_Version_v051.xsiaddon in your favourite workgroup.
Install the ns_Version_v050.xsiaddon in your favourite workgroup.
Install the ns_Version_v049.xsiaddon in your favourite workgroup.