I'd rather not move the entire content of my wallet if it is avoidable....
If you really want to export private keys, you should do this under a safe, isolated operating system. If you are using windows, you have to assume that you are compromised by default because it's closed source, even tho you are most likely OK, when it comes to money, you better be extra paranoid.
This is why Tails is a good idea. Tails isolates everything, you boot with the DVD, download the ISO with torrent for automatic checksum verification so you know you are not getting main the middle attacked.
Use Tails, which has in-built Electrum btw, so get the seed loaded, get the private keys, and export to BCC or whatever you want. That is think the safest way.
You don't need to know how to do anything else. I never used Tails, other than creating a paperwallet, and if i had coins in Electrum, that is what I would do.