you can recover it if you have the flow.xml.gz present in archive directory . You can open nifi.properties and search for the property- nifi.flow.configuration.file. This property defined the flow file that will be loaded while starting the nifi. Also, nifi takes the backup of flow.xml in a location which is defined by the propety nifi.flow.configuration.archive.dir.
You can replace the flow.xml.gz with the archive one and reboot the nifi. The older flows will be recovered.
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