I'm using Linux Mint 19 and have been backing up daily with BackInTime. On previous occasions when I have restored files claws-mail has re-opened just as I left it.
On this occasion it keeps presenting me with the first run wizard and ignores my existing rc files.
I'm guessing that there's a file which tells it that there is no pre-existing configuration, but don't know what that is. Can anyone help? I don't want to lose all my filters and rules!