So, guys, here I come again.
After restoring one site with re-uploading, like @arjen said, I restored second one with shell command, like @Macrura proposed.
First site (restored by re-uploading) was ok, opens and works fine, until I tried to login to admin (went to admin url) to add new template. It throwed this error:
Error: Class 'InputfieldText' not found (line 7 of /...path-to.../wire/modules/Inputfield/InputfieldPassword.module)
Now the is site down, throwing same error at any page.
Second site, fixed with shell chown command, works smooth.
So I tried to run chown on the first site, but after execution, site refused to display anything (including error message, that should be displayed, as debug mode is on). I got 500 error, blank page, and no logs, not even in /site/assets/logs/error.txt.
After that I tried to fix that by re-uploading that bunch of files like @arjen said. That helps a bit, now error message can be seen, but no more.
Site still throwing the same "Error: Class 'InputfieldText' not found".
I'm stuck again. Any suggestions?