The process of converting digital objects from obsolete, at‑risk, or non‑sustainable file formats into current, well‑documented formats (or representations) intended to preserve long‑term accessibility and usability while documenting any changes to content, structure, or metadata made during conversion.

Principle

Migration trades representation fidelity, authenticity, and risk of obsolescence against accessibility and sustainability; each migration should follow validated procedures, document technical and semantic changes, and include quality assurance to detect data loss or functional degradation.

Demonstration

Illustrative scenario: A repository identifies a set of legacy audiovisual files in an unsupported codec. The preservation team transcodes files to a long‑term preservation format, records original bitstreams and metadata, verifies checksums before and after conversion, and documents any lossy transformations and playback differences for future users.

Misapplication

Performing bulk format conversions without format profiling, validation or preservation metadata and then discarding originals. The error is plausible for efficiency reasons; semantically it treats conversion as neutral, ignoring that transformations can alter content fidelity, metadata linkage, or render embedded functionality (scripts, interactive elements) inoperative.

Consequence

Properly executed migration maintains access to digital content across technological change and reduces risk of format obsolescence. Misapplied, migration can irreversibly alter or lose information, break provenance chains, and impose costly remediation obligations later.

Reversal

When preserving original behaviour or exact bit‑level authenticity is essential (e.g., digital forensics, legal evidence, or interactive works), emulation, virtualization, or bit‑preservation strategies may be preferable to transformation; some formats resist faithful migration without loss.

Boundary

Clearly within: planned preservation migration of at‑risk file formats to documented archival formats with QA and documentation. Boundary case: on‑the‑fly conversion for interoperability (transient format changes to enable access) that may not be recorded in preservation metadata. Clearly outside: simple one‑off user file format conversions performed solely for immediate interoperability without preservation intent or documentation.

Semantic Tension

Fidelity and authenticity (preserving original representation) versus accessibility and sustainability (making objects usable on current platforms); minimizing information loss can conflict with achieving long‑term usability at reasonable cost.

Synthesis

Format migration is a risk‑management action balancing fidelity, documentation and cost: it preserves access by transforming representations but requires procedural controls, provenance recording and judgement about acceptable change.