The Conservation Unit was established in 1975 to restore and repair documents and prevent deterioration or destruction of the archives collection. The first Restorer in this unit was a Bookbinder, but acquires broader expertise through overseas training in conservation work. The unit has grown over the years and is now very crucial in supporting preservation work at the institution.

The main function of this unit is to restore documents to usable state and repair documents which would have been affected by physical, biological or chemical agents or combined effects such as floods or fire.

The unit is equipped with machinery and tools for bookbinding, re-binding, and guarding, issuing, repairing, reinforcements of fragile documents making protective enclosures for valuable documents, de-acidifying cleaning and flattening of documents as well as letter typing for labelling documents.