There are two seperate save functions on the Explorer XS.
1.User A & B, These are used to save your preferences in regards to Sound, Depth, Audio, Response, Threshold, and Gain. If you share your detector with a spouse or friend you can both set up your own favorite patterns, or if you are the only user then you can set up for diffrent situations such as Trashy areas, Maximum depth, Beach conditions, or Clay ground, ect.
2. You have 6 slots available for programs. Plus you have the original coin pattern that can always be reset by holding the power button for a few seconds untill the intro sounds stop. If you want to keep the peviouse set up for a pattern before you make changes I would save it to the #1 pattern slot as this will be your base pattern you started from. If your starting from the original coin pattern programed into the Explorer than you don't need to save it as you can always access it again through the power button hold startup.
Hope this helps. and good luck, Miles