If you want to back up the design of the report:
- make a copy of the mdb file, or:
- make a new mdb and import the report and its source query, or:
- use the undocumented SaveAsText.
If you want to make a backup of the data in a report at a point in time:
- use the Snapshot viewer, or
- create a PDF (if you have the software), or
- use TransferText or similar on the report's source, or
- write the records to a logging table.