Merge two archive

I accidentally archived omnifocus at another computer instead of my primary one. The software reminds me that only archive at one computer. I am not sure if anyone knows how to merge two archives. Or simply revert the recent archive, so I can archive again at my primary computer.

I searched and found one solution but I cannot find the export backup option in my menu.

Thank you!

You can open them both up, and then manually drag tasks from one to the other. It’s a kluge, but it works.