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doc: Warn about wallet.dat re-use and backups

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See discussion in #18205 and https://github.com/bitcoin/bitcoin/pull/18219#issuecomment-594871230.
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Albert 2020-02-28 13:46:31 +08:00
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@ -78,6 +78,10 @@ Subdirectory | File(s) | Description
3. A wallet database path can be specified by `-wallet` option.
4. `wallet.dat` files must not be shared across different node instances, as that can result in key-reuse and double-spends due the lack of synchronization between instances.
5. Any copy or backup of the wallet should be done through a `backupwallet` call in order to update and lock the wallet, preventing any file corruption caused by updates during the copy.
## GUI settings
`bitcoin-qt` uses [`QSettings`](https://doc.qt.io/qt-5/qsettings.html) class; this implies platform-specific [locations where application settings are stored](https://doc.qt.io/qt-5/qsettings.html#locations-where-application-settings-are-stored).