At last we are ONLINE.
When our website gone down we'd trying to get response from our hosting provider. But first mail from DC came just in 8 hours. They've informed us that:
"The entire server is down and we are working in it right now to fix it."
Ok, we've started to wait. Several hours after that we've got:
"Yesterday one of our shared hosting server had a Hard Drive Failure at one of the File Systems. We have tried to recover the server without success. As we keep the sites files in a separate drive the websites are intact but the databases are in the broken drive. We are trying to do a backup of what we can and we are going to rebuild a new server. We have no ETA but we are working hard to have the service available ASAP."
Ok, we had nothing to do but wait... We ask our admin to find new server asap. But later we've got mail:
"At this point you should have your login details for the new hosting account. We have uploaded our backup of your site to the new server. Please login to the control panel and edit the database password to match your scripts and create your email accounts. We would like to know your experience with the new server so any comments would be appreciated."
So, we started to recover all. Now we have our website online, but connection speed is very slow. Hope it will be resolved.