Thank you all, It's just a new way of interacting and was afraid that almost everything was done online. I think holding the wire transfer, account application and statements would be good enough as per your posts also researching online Thank you)
Just save your online account statements as pdf documents to your hard drive as often as you want. There is an option to do this in account management
You get statements - electronic which you can print off each month. You sent them money and you can keep a copy of that. (I think IB will send printed copies of certain things if you request it that they are required to - not sure what they are required to but perhaps your account application with the terms and conditions of your account.)