This information was shared by a helpful/smart user in the Presearch Node Telegram channel & I did not capture his/her TG handle.
If you would like to backup your node keys and then either move your node to another server or restore your node on the same server, here are the updated instructions:
1. On the original node’s server, ensure your node is CURENTLY RUNNING and run this command:
docker cp presearch-node:/app/node/.keys presearch-node-keys
2. COPY the presearch-node-keys folder anywhere on your new server and open a command prompt in the folder that contains that presearch-node-keys folder.
3. Run the following to restore your backed-up keys to the new server:
docker run -dt –rm -v presearch-node-storage:/app/node –name presearch-restore presearch/node ; docker cp presearch-node-keys/. presearch-restore:/app/node/.keys/ ; docker stop presearch-restore
docker run -dt –rm -v presearch-node-storage:/app/node –name presearch-restore presearch/node & docker cp presearch-node-keys/. presearch-restore:/app/node/.keys/ & docker stop presearch-restore
That’s it. Now just install or start the node on the new server using the normal node start commands! Be sure you stop your node on the old server first, though, or otherwise you’ll get “duplicate node” errors when connecting to the network.