You're not real clear. Do you mean you want to restore after a crash or you want a backup of the system before it crashed? And did the application server, database server, or both crash? In the worst case you'll need to reinstall JIRA and then restore the database. If you're using the JIRA built in backup it is a simple, but sometimes lenghly, import of the xml/zip file. If you're using a database tool to backup the database you'll need to restore it and then point JIRA to it.
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