If the car is stored in an enclosed space, I would check it regularly for condensation.
Left outside, Europas seem to leak, some quite badly through the doors, and one I have left for about a year had 5 litres of water in the petrol tanks. Plus on some TCs, water gets into #1&2 spark plug recesses and sits there rusting the spark plugs.
Dry storage is the way to go, but condensation, particularly in sub zero winters, would be my concern.
Disconnect the battery, and when you take it out of storage, drain the petrol to check for any contamination. It is very easy to do with brass drain plugs at the bottom of each tank, a 5/8" ring spanner soon releases them.