Extra bikes are nice... I keep a couple around. Cracks and rust I'd watch for. Cables can get nasty, so they often need replaced. Tires turn dry and brittle around here quickly (dry ole Nevada). Make sure whatever is done is worth it.. some folks I swear spend 3x on the bike what it's worth, and they could've done better getting another.
Best wishes.. I have a century coming up and not many long recent rides in on my legs. Oh joy.
A ship is safe in harbor, but that's not what ships are for.