In this chapter:
(1) "Electronic storage" means the maintenance of local government record data in the form of digital electronic signals on a computer hard disk, magnetic tape, optical disk, or similar machine-readable medium.
(2) "Local government record data" means the information that by law, regulation, rule of court, ordinance, or administrative procedure in a local government comprises a local government record as defined by Section 201.003.
(3) "Source document" means the local government record from which local government record data is obtained for electronic storage. The term does not include backup copies of the data in any media generated from electronic storage.