Urgent Help: interview for GC

I have one question about coming interview for permanent residence based on marriage with US citizen. I need to bring documents listed on the appointment notice. One document is a complicated affidavit of support (Form I-864) with all required evidence. I have the copy of those materials that I ted for the original application awhile ago. I wonder if the copy is enough, or I need to prepare new, latest notarized I-864, employment letter and such.

Thanks.