You can find call recordings in drupe Settings -> Call Screen -> Call Recorder -> View recorded calls. There's no need to worry: your recorded calls are stored locally in your device's storage by default. drupe does not store any of your recordings, nor do we have any access to them whatsoever - all of your info is accessible to you alone.
Note: since Android 9, Google has prohibited third-party apps from including the Call Recording feature to protect users' privacy rights. Now, this feature only functions on Android versions released before Android 9.