I think the suggestions made by #2, #3 are way over my head I wouldn't know how to do it.

#4 I am not sure if I put the SD card from the N800 to the N810 since it only takes MicroSD Mobile with an adaptor.

I just realized how practical is the N800 which can handle averg size SD cards, I have 8GB SD on my N800.

I bought a 2GB Micro Mobile but haven't done much yet, and that is why I am trying to figure out how to copy the Apps I have installed on N800 vs searching for sites where to download them, and I have a lot of them.