Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 215, § 53

The commonwealth shall provide and maintain suitable rooms for the use of the probate courts, ample fireproof rooms and suitable alcoves, cases and boxes for the safe keeping of all records, files, papers and documents, whether in physical or electronic form, belonging to the several registries of probate, and shall also provide all books necessary for keeping the records, and all printed blanks and stationery used in probate proceedings.