JIRA 6.2 and above comes with built-in auditing capability that tracks project deletions and other activities. There is also a commercial add-on available in Marketplace called Auditor for JIRA which provide robust auditing capability.
You cannot, once a project is deleted it is gone forever.
In case you want to rollback your options are to restore your backup into a test instance and doa project import of that deleted project.
Also see these links for more details
https://answers.atlassian.com/questions/44928/how-to-undelete-a-project
Pilar
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