If, for any reason, it is necessary to restore all the information for all my Jira projects, does Jira provide the data again?
Atlassian does have a backup program in place, but does not create backups for the purpose of restoring data that you did destroy yourself as a customer in any way. You can read about Atlassian backup policy right here.
In your Jira instance system admin settings, you can create a backup yourself and - with some limitations - automate creating backups.
These backups are not suitable for restoring a single project or an issue you accidentally deleted, to name a few examples. If you need more granular control, it may be worth looking into a suitable backup solution from the Atlassian Marketplace.
Hope this helps!
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