Duplicate animation and play in reverse

Hi all,
I'm brand new to Fusion so this is a noob question but i've had a bit of a look at the forums and the manual and couldn't find anything.

How can I duplicate an animation, tack it on to the end of the original and then reverse the playback?

I'm working on a simple little animation of a star thing I made in Blender. It's just a little bit of camera motion but I want it to "rewind" so it can be a perfect loop.

Thank you in advance.

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TimeStretcher will do what you need. Make sure you're at frame 0 when you add it to the comp because it will come in with a keyframe already set. Go to the end of your animation and set a keyframe equal to that time. Go to the Spline View, turn on the spline for the TSt, select both keyframes, and activate the "Set Ping Pong" switch.

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Thank you very much, I will try it this weekend!

@Bryan Ray: Thanks for your post, this is very very helpful!

Missing any retime explanations, especially for time machine... hope to find somewhere more info.