Where digital data are generated directly from instruments, which of the following should be avoided?

Time stamping, cleaning for duplicates or similar processing,
      and archiving original data.
Keeping originals of other related data products and descriptions
      (i.e., instrumentation calibration data) separate from
      corresponding data.
Keeping exact information on original data formats and what has
      been done to the data.
Documenting and archiving the source code of any software that
      was used to prepare the data.