Sorry to hear that. Confluence have a daily backup enabled stored in your Confluence HOME directory under the backup folder. I would recommend you to restore this backup and generate space export from there.
Once your space export generated, you should be able to restore it back into your instance.
Hope it helps.
To restore a page, you may find the wanted information in the Restoring a Deleted Page documentation.
To setup Confluence in a staging environment you may need to use a Developer License.
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