Hi
How encrypt backup of Bitcoin Classic?
Sorry for my question, I suppose there should already be a discussion about this but I cannot found some specific information.
Same as with bitcoin core, set a password for the wallet and it will also be used for the backup file. Keep in mind though that the wallet is only encrypting the private keys. If you worry about someone getting your addresses from the backup you should put it in encrypted container (e.g. using VeraCrypt).