The latest version of NostrSync is now live. Create a copy of your Nostr data from all existing relays. It will also broadcast your data to ensure it is updated across all the relays & store it in an in-built databases. 
https://nostrsync.live/
https://image.nostr.build/a949d617d3a057e50315e6d5764dfe3389cf889052567e95f69e486292a11fa6.jpg