Keeps 4 days refrigerated and freezes 3 months, cooked or assembled-but-unbaked. Bake from frozen at 375°F for about an hour, covered for the first 40 minutes. Reheat portions covered so the top doesn't dry out.
Yes — it's the best make-ahead pasta dish there is. Refrigerate covered and add 10–15 minutes to the bake time from cold.
Not enough sauce. Pasta absorbs a surprising amount in the oven, so use more than looks right, especially when baking from cold.
Ziti is the pasta shape. Baked ziti layers it with sauce and cheese; lasagne uses flat sheets and usually béchamel. Baked ziti is far less work.