Well, saving an LLB is not something you can do just like that. You
can save VIs of course but doing so by hand one for one is probably
not what you want to do.
Instead by masscompiling all VIs of the entire project in memory you
mark them as needing to be saved and then Save All will take care of
saving them to their original location.
One other thing you could do as well is using the "Save with Options"
dialog. Select Entire hirarchy to new location, maintain hierarchy or
something like that and you will get a complete directory hierarchy
which will basically show you from where LabVIEW pulled the different
VIs. This is quite handy to find out of tree references of VIs, which
can happen sometimes if you are not careful with opening VIs while you
work on a project.