In the GUI, the wallet is selected in the `Wallet` drop-down list in the upper right corner. If this list is not present, the wallet can be loaded in `File` ->`Open wallet` if necessary. Then, the backup can be done in `File` -> `Backup Wallet...`.
In the GUI, the wallet is selected in the `Wallet` drop-down list in the upper right corner. If this list is not present, the wallet can be loaded in `File` ->`Open Wallet` if necessary. Then, the backup can be done in `File` -> `Backup Wallet…`.
This backup file can be stored on one or multiple offline devices, which must be reliable enough to work in an emergency and be malware free. Backup files can be regularly tested to avoid problems in the future.