There are two ways how to do it.

First option

You can back up your wallet.dat .
Go to start, type %appdata%\impact and press the enter key. You will then be in a folder with the impact app-data.

File wallet.dat holds all private keys to your addresses. (copy this file on same safe place)

To restore your holdings. Install new wallet and paste wallet.dat into folder impact. (%appdata%\impact)


Second option

Or you can save private keys from your wallet.

For example for address:
Xn7R6GyfCwojGarEAGvj6iimo5op7uQKzM

In wallet go to console and write:
dumpprivkey Xn7R6GyfCwojGarEAGvj6iimo5op7uQKzM

Wallet will give you private key to address...

output look like this:
XBr9bozqj2wzwGAbYq98qQ89bekgZe2Vj1dkNoma46Wfhn8qnpC7

For import private key, use this command:
importprivkey Xn7R6GyfCwojGarEAGvj6iimo5op7uQKzM

And that´s it. You now have access to address.
You can import private keys into any IMX wallet to get access to coins on this address.


Test:

Address Xn7R6GyfCwojGarEAGvj6iimo5op7uQKzM contains 1000 IMX coins.
The first one who will import private keys can take them. (send them to your address, before someone else will)

Private key:XBr9bozqj2wzwGAbYq98qQ89bekgZe2Vj1dkNoma46Wfhn8qnpC7