I have two instance of jira. need to backup instance A then import from instance B
Yes, that's the procedure - backup, then import.
Could you tell us what your actual question is here?
backup done; Whenever trying to do that; the below message stop me:
You don't have any valid JIRA Export on the root WebDAV directory. Please upload some and try again.
Ok, sounds like you haven't uploaded the backup from the source system up to the target one.
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