Try using this plugin - Export Manager for JIRA. It should allow you to download the backup without connecting to the host.
You've not described your setup, so we really can't tell you much. All we can do is give you the principles - you need to get a copy of the database, and you need a copy of the attachments.
With zero useful information about your setup, that's it, nothing else I can say might be useful.
I have installed JIRA on linux machine (JIRA Download). I had a ssh access to the machine to this is how i installed it. But recently I couldn't access it by ssh. So i am looking for some way that can save the issues.
If there is not, maybe an option to export the issues to xml and import from xml?
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