FMbackup.sit is a useful utility. It keeps a current backup copy of your .fs_cache (in compressed form) so that after a crash (toolbox or A/UX), it restores the backup copy before you restart the Macintosh. You don't have to manually relocate icons, windows, and so on.
You can find FMbackup.sit posted on A/UX Support Server (aux.support.apple.com). Here is the path:
aux.support.apple.com (130.43.6.2)
/usr/spool/ftp/aux.patches/unsupported/2.0
This version of FMbackup utility works under A/UX 2.0.1 and A/UX 3.0, but doesn't work properly under A/UX 2.0. The README file included in the package gives the details.