-snip- I'm using windows OS. After I made a backup of my wallet to usb drive from my old computer then where I have to save the copy the backup wallet in new computer, is there special directory to save or electrum application will move/copy the backup wallet automatically to the proper directory once I open (via file > open) the backup wallet (from USB drive) in electrum application which is installed on new computer.
The former is quite true but it's more of a "
default" directory rather than "
special" directory since you can load a wallet from any directory.
Once you loaded a wallet from a different directory, it will automatically load that wallet and browse to that dir when loading (
File->Open) another wallet.
Even if a wallet from a different directory automatically opens when starting Electrum, it's not moved or copied to the default directory.
In case of Removable Drives, after plugging it out: "
load" will revert back to the default data dir and Electrum will lose track of the previously loaded wallet.
Another question can you create standard wallet then add 2FA later on or you have to create 2FA wallet from the beginning...
You can't but Electrum has multi-wallet support.
With that, you can just create a new 2FA wallet, then send your funds from the standard wallet there.
Take note that Electrum's 2FA wallet is backed by a third-party which incur cost per 20 or 100 transactions (
more info here)