I'm not married yet, will get married in 3 months, but I'm already starting to compile all my communication/relationship evidence.
Here's what I did:
-Used a program to convert all text messages into printable format, copy/pasted into word, took sample screenshots of txt messages from phone to prove they're real
-Took screenshot of me webcam chatting with my fiance, the screenshot shows both our faces, the time/date and duration of the chat
-Saved all Yahoo/viber messages, copy/pasted onto MS Word
-Scanned copies of all envelopes/letters sent to each person
-Took pictures of timeline Facebook showing our interactions with each other, as well as our friends/family commenting on our posts, very critical we show when we first "In a relationship", and all her friends/family commented about that, as well when we first met together in Vietnam, showing their comments, and finally when we got engaged, showing their comments. I feel the comments is important, as it shows her family and friends are aware of our relationship and support it.
-Put 2 photos per sheet of paper, with comments written below them, describing time/date/event/location/who took picture, we plan to have 200+ pics
-Showed receipts of gifts I bought for her, made a cute scrapbook detailing our time together during our Vietnam trip
-Kept receipts of all hotel stays and flight/bus tickets during our travels
-Will keep receipts of all wedding preparations, honeymoon, etc (when it happens in Dec 2013)