The Spare Key Is Cheap Until It Does Not Work
The spare key has lived in a kitchen drawer for three years. Nobody remembers whether it opens the current front-door lock or the one replaced after the handle broke. It looks like a plan right up to the moment someone is standing outside in the rain.
A working spare can turn a bad afternoon into a short detour. A mystery key, an unreachable key, or a dead electronic fob offers reassurance without access. The difference costs little on an ordinary weekend and can cost a locksmith visit, towing, missed work, child-care overtime, or lodging during a lockout.
Build the plan while every lock is available and nobody is late. List the access points the household relies on, confirm who is allowed to copy or hold access, test every backup, and decide how a locked-out person would retrieve it.
Start with the places and vehicles whose loss of access would cause immediate trouble: the main home entrance, apartment building, car, garage, gate, mailbox, storage unit, work site, or a relative's home where the household provides care. Do not copy everything. Identify the access that protects ordinary life.