Warning: Do not attempt to maintain your toaster without reading this guide.
To maintain a toaster that exists in multiple places at once, you'll need to understand the fundamental principles of Quantum Uncertainty.
Principle 1: The Toaster's Existence is not Fixed
The toaster's position and state are not fixed in time and space. You may find it in the kitchen, but also possibly in the living room, or on the couch.
Read about the Toaster's Multiple Locations
Principle 2: The Toaster's State is not Fixed
The toaster's state is not fixed. It may be on, off, or possibly toast-ing at the same time.