Were going to build us a new tree, but we will be using some of the old
settings like Firewall-filters. But we almost forgot the ACL list, my
question is if you could export our current ACL list and import it to our
new tree. Or do we have to manually rewrite it all.

An upgrade of the server is not an option.

Old tree is using BM 3.7 on a NW 5.1
New tree will be using BM 3.8 on NW 6.5