Well, I imagine rule 3 of time travel will apply.
- Don't change the outcome of WWII.
- Don't kill your grandfather.
- Don't have sex with your self from another point in your personal timeline.
- Don't add yourself into background scenes on the Death Star in Star Wars.
- Don't step on butterflies in the Lower Cretaceous period.
I've been downvoted by someone who wants to have sex with their time-clone! Or possibly a kinky Lower Cretaceous butterfly.