Answer: backup

AnswerCrossword Clue
BACKUPSupport or go in reverse
BACKUPSupport.
BACKUPAlternative
BACKUPOverwhelmed police officer's request
BACKUPPut it in reverse
backupone that serves as a substitute or support a backup plan
backupcopy of computer data (as a file or the contents of a hard drive)
backupaccumulation caused by a stoppage in the flow traffic backup
backupa standby (one who can be relied on)