How do I restore a backup?
I use the console.
To restore backup you need to put your wallet keys to
$HOME\AppData\Roaming\Webchain\mainnet\keystore (on Windows) or to
$HOME/.webchain/mainnet/keystore (on Linux)
And then you can use them from console or GUI app
Thank you, it worked out perfect.

Now, I have my wallet running on two pcs.
Someone should post commands to use the console. Would be very interesting.