I explained this procedure in Troubleshooting guide for Umbrel see the section about copying the existing data from another node.
This command will connect your new node to existing node, no need for any intrerruption or taking the drive out tyo copy. Just link them.
Enter SSH into your new Umbrel node, then:
cd ~/umbrel/bin
bitcoin-cli addnode "192.168.0.6:8333" "onetry"
replace “192.168.0.6” with your existing running node IP.
https://chainquery.com/bitcoin-cli/addnode
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