A useful backup restores files and preserves references alongside images. Organise first, then verify copies; synchronisation alone can propagate deletions.
The method, step by step
- Collect digital originals, inventory, transcripts and tree exports in a clear structure. Keep files tied to identifiers and instructions for opening their formats.
- Keep several copies on distinct media or locations, including one protected from a main-device incident. Separate preservation files from working copies.
- Restore a sample and open it. A SHA-256 checksum compares binary identity between copies; it verifies neither historical accuracy nor image quality.
- For this site’s log, export JSON for restoration and CSV for reading. Browser storage can be cleared; include exports in backups and verify them after adding notes.
Record in your research log
- File
- checksum
- check date
- tested copy
- result.
Frequently asked questions
Is synchronisation enough as a backup?
Deletions and errors can synchronise too. Keep independent copies, test restoration and check images, transcripts and citations are included.
How do I verify a digital copy?
Open it and check pages, readability and citation. A checksum compares file content through its computed value; it does not validate reading or interpretation.