Event ID 3021 — The Backup master policy is set.

{
  "system": {
    "provider": "Microsoft-Windows-CloudStore",
    "guid": "741BB90C-A7A3-49D6-BD82-1E6B858403F7",
    "event_source_name": "",
    "event_id": 3021,
    "version": 0,
    "level": 4,
    "task": 0,
    "opcode": 0,
    "keywords": 9223372036854775808,
    "time_created": "2023-11-05T22:29:02.865478+00:00",
    "event_record_id": 17,
    "correlation": {},
    "execution": {
      "process_id": 5784,
      "thread_id": 6016
    },
    "channel": "Microsoft-Windows-CloudStore/Operational",
    "computer": "WinDev2310Eval",
    "security": {
      "user_id": "S-1-5-21-1992711665-1655669231-58201500-1000"
    }
  },
  "event_data": {},
  "message": ""
}