Hi Anh Tran!
I have using MetaBox on a lot of projects and now, one more time. But in this time, I'm developing a e-commerce using WC and I found a specific necessity: clone pages where meta data is recorded in custom tables. Why?
Well, imagine that in e-commerce to do A/B test and create flash sales is a normal activity. So, sometimes is necessary to make small changes in homepages and rollback after some hours or days.
Another times create variations of a landpage to delivery more specific context to customers changing some details, is too a normal practice.
With this in mind, re-build a page each time that you want to create a variation is a hard work. One extension to clone posts would be a great idea. What do you think?