Tips on Drying food?
When a recipe calls for dried fruits or veggies, can I use a dehydrator and how long can those items be saved?
You mean you want to make your own dried fruits/veggies for use in recipes? Absolutely, and your results will no doubt be better than using store-bought dried stuff.
Dried foods usually keep very well, but I'm new to the dehydrating world (I've had one for less than a week) so perhaps check the guide that came with it for storage tips.