ANY time you have a disposition in court, other than possibly a civil traffic offense, you need to keep a copy of the disposition. Computerized records have improved in recent years, however, there can still be cases where a disposition is coded incorrectly, or the PD had problems determining exactly what the disposition was. Having a court certified copy of the record showing it was a CWOF and not a conviction can be very handy.
The most interesting case I heard of was someone turned down for a MA LTC because of an out of state bail forfeiture. The MA police department thought this meant "jumped bail", however, what it meant was "charges dropped in return for the defendant agreeing the court could keep the bail". It took a rather decent attorney to get it straightened out. Contemporaneous court records from the actual case might have saved that applicant some legal fees.