If you’ve found a relevant reference to your ancestor on NAAIRS and need copies of file contents consider using the document ordering facility offered by eGGSA
The only repository not covered by this service is the Cape Town Archive Repository (KAB) who offer their own copying service.
Documents can be obtained through eGGSA from Pietermaritzburg (NAB) for
Durban (TBD), Bloemfontein (VAB) for the Orange Free State
and Pretoria (TAB) for the Transvaal.