Reset ACS to its default configuration

When you finish you labs on router, pix or switch you erase configuration to be able re-doing lab or to start a new lab… But what about ACS if you add device, create users, groups… how to remove it, how to have default ACS settings???… There is nothing like write erase command so I use following easy trick…
When I install new ACS my first step is backup this fresh configuration
System configuration —>ACS Backup

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Backup files are stored in the folder
C:\Program Files\CiscoSecure ACS v4.0\CSAuth\System Backups
File is named by default with format day-month-year time.dmp but you can manually rename it to whatever you want (as i did to defaultACS.dmp)

Than you can restore configuration anytime with
System configuration —>ACS restore
and just select your backup file and click on restore