The Back-up is a returning equipment in Risk of Rain 2.
Each of the drones spawned lives for 25-28 seconds.
Lore[]
"The inclusion of Rapid Response Drone Squadrons (RRDS) by local law enforcement marked a dire turning point of Plank's Rebellion. After its massive "success" in quelling the Rebellion - and subsequent implementation across Mercury - underground drone hackers became highly sought after by black market users." -Overview of Drone Technology, Vol.2