Backdating employment contract
Fast forward to today, my employer is asking me to sign a non-disclosure agreement.
If you have any doubts that you may have done (or even forgotten) something that may violate the terms of the NDA you should raise them with your employer before signing.
While it's likely a non-issue, it's important to protect yourself.
One possibility I haven't seen covered is the chance this is an honest mistake.
If you think someone might want a good reason why you don't sign: Well, obviously by having an incorrect date you would be effectively lying - you would make it look like you signed two years ago, when you are signing right now. Rather than try to balance your loyalty to the employer and loyalty to your principles (and generally the truth), I strongly recommend not signing the backdated document.
A lot is at stake for you personally with this silly document.