Hi Ayushi Gupta, As per my understanding; It is not possible to get the last revision if the network entity is deleted from the system.
If you are using Neo4j or H2 database then you can try to import the last backup to some other instance and check if the network entity exists. If yes, take an export and import it in your instance.
For future; I would recommend you to take a regular backup of your instance.
I hope it helps.