You cannot directly copy saves from an Xbox One/Series X to a USB drive in the same way you did on the 360. The files are locked behind the "Cloud."
While PC players have always had access to the developer console, console warriors on the Xbox 360 were left in the dark—until the rise of the . This tool is the digital crowbar that pries open your save file, giving you god-like control over your wasteland journey. fallout 3 xbox 360 save editor
Just remember: With great power comes great responsibility. And also the risk of turning Three Dog's voice lines into a garbled mess because you corrupted the audio flags. Save often, edit wisely, and stay safe out there in the wasteland. Disclaimer: Modifying game saves violates the Terms of Service for Xbox Live achievements. If you edit your save to unlock "The G.O.A.T. Whisperer" instantly, you may be flagged by TrueAchievements or leaderboard systems. Use offline. You cannot directly copy saves from an Xbox