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I have confusion between
/ZwaveAPI/Run/Data0
and
DeviceData.xml
both of this database elements in z-way. What difference they have, how they related to each other, when they get updated, which data base z-way really uses for device communication and so.

Thanking you.

(mind the spelling and syntax) gives you the complete actual data tree
File config/zddx/yyyyy-DevicesDate.xml represents your actual devices configuration. This file goes into the backup. I think it is only updated after a configuration change

Sorry for the mistake. Will it updated for each configuration change?, like Inclusion and Exclusion as well. But i have noticed that .xml file is updating only if something like inclusion happens, but Data/0 tree getting updated for all the changes. I have not understand, if one of this file corrupted what will be the situation. Which is the main resource file here?

/ZWaveAPI/Data/0 is not a resource, it is a JSON format snapshot of the internal data of the Z-Way controller. So it can give you the actual status of your machine.
The XML is for recovery of your system in case it breaks down

Is there chance to break both?. Problem i have is that some how i lost commandclasses of some or all devices i already included and z-way not answering for those devices. Is there anyway to recover from these situation, i am using Z-way V1.7.0. Downloadback and restore backup both functions are not working in z-way interface.

You are opening three different topics on what essentially is one problem.
viewtopic.php?f=3419&t=21162
viewtopic.php?f=3419&t=21122&start=10
PoltoS did ask you some specific diagnostic questions, to which you do not give a straight answer. Asking additional questions does not bring you further
In those circumstances, and based on my own sometimes bitter experience, I can give you only one advice: Start over and rebuild a clean virgin installation based on version v.2.0.0 (don't try any release candidates yet).
There are plenty of testimonies here from people who successfully took that route.

Maybe three problems are relelated, but i dont know wether previouse mentioned problems come because of the same issues. This point i wanted to clarify here. I could not get PoltoS answer, thts why i had to post question again. Your correct v2.0.0 may have betterment but i am restricted to v1.7.0 now.

Well it is your choice to stay on a known unstable version. As I don't have that version active, I am afraid I can't help you further.

Thank you for your posts.