It's been a while since I was running my node on an Umbrel, so it may have changed since then. Check with the folks nostr: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

My knee-jerk assumption about backups is, they are out of date each time you send or receive, since whichever channel the transaction went through has a new channel state, but someone with more LND smarts than me may know better.