If the heap dump analysis takes up a too much disk space, you can switch off the heap dump analysis saving altogether on this tab. The analysis will then be created each time you open the snapshot. In general, if a heap dump analysis is missing or incorrect (e.g. from a different snapshot) it will simply be recreated.
The default storage format for the heap dump analysis is directory-based, e.g. if your snapshot is saved to snapshot.jps, the analysis is stored in the directory snapshot.jps.analysis. In that directory there are multiple files and further subdirectories that contain the entire analysis. If this is not practical for some reason, you can choose the TAR archive or Compressed TAR archive options on this tab. Both of them make moving snapshots together with their analysis to a different computer easier since you only have one additional file. The compressed tar archive option is noticeably slower than the alternatives, but takes up less disk space.