in reserve

• backupStored duplicate for recovery
• standbyReady substitute awaiting use
• storedKept in reserve
• spareHeld in reserve
• savedKept from loss

stockpile · waiting · held · emergency · rainy day · surplus · cache · stash · tucked away · on hold · untapped · banked · set aside · contingency · nest egg · fallback · reserved · safeguard

• standbyready, waiting, on hold, on call, backup
• Sitting Outbenched, sidelined, on the bench, on the sidelines, sitting idle
• military statusactive duty, enlisted, retired, deployed, veteran
• readinessready, prepared, set, alert, primed