In many Bregaglia homes there are still family letters and interesting historical documents worth holding onto. The goal of the Archive is to preserve the information, catalogue everything by date and make the data available for researchers and other interested parties. The Archive asks that anyone possessing old documents give them to the Archive rather than throwing them away.

The documents catalogued at Castelmur consist of purchase agreements, property appraisals, inventory lists, and family letters. Especially fascinating are the emigrant letters written during the 19th and 20th centuries, at the height of Graubunden emigration. In the files there are also agreements between municipalities and townships, wills, civil and criminal proceedings, and passport documents.

The author, Dolf Kaiser, together with Florio Pult layed the foundation for the Archive, when they wrote about the Graubunden emigration in "Fast ein Volk von Zuckerbäckern," (transl. Almost a Nation of Pastry Chefs) and created the 1989 Graubunden pastry chef exhibit at the Zurich National Museum. The exhibit was then given to the Castelmur Museum as a gift.