One more question, in case something happens to jaxx wallet, lets say app for some reason stop functioning. Is it enough to have 12 words backup and private and public key back up, or we need to backup private key regularly, i.e. do we have to backup private keys after new transactions occurs?

I currently mine zcahs, and I'm using jaxx for payments from the pool. After generating t address I have done back up of 12 words, and private and public keys, so my question is do I have to backup keys again after few months time or is it enough that I have done initial backup.