Whenever run autoconfig, will generate a directory 'MMDDhhmm' under $APPL_TOP/admin/SID_HOSTNAME/out. Inside the directory, there will be several files which autoconfig has taken a backup of existing one before making changes to that. And also create a file to restore named as 'restore.sh'. This script will do the copy of backup files to the original location and this has the effect to rolling back autoconfig run.
[applmgr@devtapps ]$ cd /apps/devtappl/admin/DEVT_devtapps/out/06111617/
Hope this helps !!