Vitamin C is lost when fruits are dried or dehydrated. However most of the other vitamins and minerals are retained.
Sulfites are commonly used to preserve dried fruit. This chemical may cause a allergic reaction in some people. Its really best to shy away from any product that contains sulfites.
Most fruits and dried fruits are graded. Most of it is extra fancy, fancy, extra choice, choice, and standard is the lowest grade. The grading is based on color, condition after being dried, and water content.
If you store dried fruits in air tight containers they will keep up to six months. If placed in a cool dry place or refrigerated they will keep up to one year. If refrigerated let the fruit come up to room temperature before you eat it for the best flavor.