49 CFR 1220.3 - Preservation of records.
(a) All records may be preserved by any technology that is immune to alteration, modification, or erasure of the underlying data and will enable production of an accurate and unaltered paper copy.
(b) Records not originally preserved on hard copy shall be accompanied by a statement executed by a person having personal knowledge of the facts indicating the type of data included within the records. One comprehensive statement may be executed in lieu of individual statements for multiple records if the type of data included in the multiple records is common to all such records. The records shall be indexed and retained in such a manner as will render them readily accessible. The company shall have facilities available to locate, identify and produce legible paper copies of the records.
(c) Any significant characteristic, feature or other attribute that a particular medium will not preserve shall be clearly indicated at the beginning of the applicable records as appropriate.
(d) The printed side of forms, such as instructions, need not be preserved for each record as long as the printed matter is common to all such forms and an identified specimen of the form is maintained on the medium for reference.