They can be either on-site, i.e. in a different part of the building, on a different floor of the building, or they can be off-site. The geographical location and distance are likely to depend on the risks you have assessed for your assets.
Identifying storage rooms in advance gives you the chance to find rooms that follow the main criteria necessary for correctly storing your movable heritage items.
It is a good idea to involve specialists for the objects and materials in question and experts in preventive conservation in the process.
Triage and inventories
Anything that is brought into the storage room should be inventoried.
A basic inventory could include a brief description of the object, its state of preservation, its place of origin and a unique identification number. With that, you always know what you have in your storage room and can find objects again.