do i have to backup the original maps to play online?
Always backup.
Thing with Anctoville & Falaise; FH2 maps are always very detailed, but this often gives bots & vehicles probs. No amount of skillful ai coding or refining navmesh will get them playing well s/times & this is when I need to resort to having the map play infantry only.
What do you guys think, should I leave vehicles in (for human fun), or take them out?
It's possible to have the vehicles in, a map plays fine with no vehicle navmesh at all, bots leave them alone.
Aberdeen is the ideal for bots & vehicles; nice open spaces (& it shouldn't be crashing..)