Broker tick history
Use the same broker you intend to go live with. XAUUSD spread, swap, and commission vary widely between brokers — testing with a different broker's history is testing a different instrument.
- MT5 → View → Symbols → XAUUSD → Bars / Ticks → Request
- Wait until the green progress bar finishes for your full date range
- Verify the start date matches what your broker actually offers