And it is possible to backup wallet.dat and then upload it into bitcoin cash client? Cuz seems I can not figure out how to check the addresses and understand is there was bitcoins on 1 august 2017.
You don't need to import wallet.dat file on Electron Cash wallet, you only need to export Private Keys for addresses which has BCH and import them into your Electron Cash wallet.
here are detailed steps for how to claim your BCH :
https://bitcointalk.org/index.php?topic=2078292.0
Thanks! I am little bit confused how to get addresses from which I need to get privkey. Cuz there are approx. 1000 addresses for all the time. And I do not know how to check was there coins at the time of fork. Maybe it is an any more easy solution present?
in that tutorial, first step is how to know how much BCH you have on your address.
if you have many addresses, you will need to check each one manually if has BCH
