I always have a NAS that is also running as a bitcoin core node, keeping a local copy of the blockchain. Any time I spin up a new node, I just copy the blocks and indexes from that NAS to the new node drive and have in few hours a new synced node.

Also I could use that NAS node as main peer to sync other nodes, pointing the new bitcoin node to sync from NAS local IP, not from other online peers (Tor, I2P or clearnet).

Run the following command:

bitcoin-cli addnode "192.168.x.x:8333" "onetry"

Replace “192.168.x.x” with the IP of the existing running node. In that way your new node will sync directly from your local node. Will still take a while, due to the fact that will still have to validate those blocks. But will be faster anyways.