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doc: describe the reason why we need to sync from an earlier date

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c9s 2021-12-07 00:18:50 +08:00
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doc/topics/back-testing.md
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@ -33,7 +33,8 @@ And then, you can sync remote exchange k-lines (candle bars) data for back-testi
bbgo backtest --exchange binance -v --sync --sync-only --sync-from 2020-11-01 --config config/grid.yaml
```
Note that, you should sync from an earlier date before your startTime, here we sync one month before `2021-01-10`.
Note that, you should sync from an earlier date before your startTime because some indicator like EMA needs more data to calculate the current EMA value.
Here we sync one month before `2021-01-10`.
- `--sync` - sync the data to the latest data point before we start the back-test.
- `--sync-only` - only the back-test data syncing will be executed. do not run back-test.