How is that possible if the OS/drive/vault is backdoored? Could you elaborate? I think "resilient" just means "backup copy" and I do think (IANAL) it is illega

How is that possible if the OS/drive/vault is backdoored? Could you elaborate? I think "resilient" just means "backup copy" and I do think (IANAL) it is illegal to destroy emails when asked for them in the US. Or was your comment ironic? Sorry, German, irony impaired.