Exactly! Beets (with tops removed) and apples both keep well in a root cellar type environment (apples will also keep a surprisingly long time in the fridge -- learned that from a local apple farmer!). Plums can be made into jam, plum sauce (Chinese or otherwise), canned or frozen (remove pits). As an idea, a friend made a really lovely Plum and Cardamom jam this summer. Remember for any canning, use tested, approved recipes and follow them to the letter (Ball Canning Book is good; so is http://nchfp.uga.edu/

Beets will keep quite a while in a plastic bin in a cool humid cellar.