Lost internet connection during initial download

Hi - my son powered off our internet router/hub while the initial blockchain download was still syncing to the hard drive. Is this a problem and do I need to start the download again

See if you have connected peers in the Bitcoin page of Umbrel. If not, better use fixed IP in your node, as it helps get reconnected to peers and to get the blocks. Use the @DarthCoin advices:
-> Follow this guide to set a static IP for your node.

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Great - thank you!