Moving courses from one instance of MOODLE to another

I'm looking to a way to move some of the courses of a MOODLE to a new instance...

I saw that run backup and restore should do the trick, however it is very unfriendly to do the process one-by-one.

There is an other way to do it in kind of batch?

Also would like to know how I can check that the whole course indeed transfered to the new instance and nothing missing (we are talking about huge courses)...

Thank you