Digital preservation

Digital preservation is the set of policies, practices, and technologies used to keep electronic records readable and trustworthy across changes of hardware, software, media, and file formats. Unlike routine backup (which protects against short-term failure), preservation aims at decades-to-centuries of access and focuses on authenticity, integrity, and intelligibility.

Goals

Practitioners typically try to ensure that a preserved object remains:

• Readable — bytes can still be retrieved from storage
• Renderable — software can still present the content (or an acceptable substitute)
• Authentic — provenance and fixity are documented so users can trust what they see
• Discoverable — metadata and persistent identifiers allow the object to be found again

Common techniques

• Format migration — converting files to newer or more open formats before old ones become unreadable
• Emulation — running obsolete software environments so original binaries still behave
• Checksums / fixity checking — detecting silent corruption (bit rot)
• Geographic and organisational distribution — multiple copies under different custodians (e.g. LOCKSS)
• Normalisation and packaging — wrapping objects with metadata (often following the OAIS reference model)

Risks

Threats include media failure, vendor lock-in, proprietary codecs, lost decryption keys, organisational insolvency, and legal barriers to copying. Commentators sometimes warn of a Digital dark age if born-digital culture is not actively stewarded.

In Foreverpedia

This wiki emphasises preservation concepts that support long-lived reference knowledge: Web archiving, Link rot, Persistent identifiers, and related cultural practices of Cultural memory.

See also

• Archive
• Internet Archive
• Wayback Machine
• Born-digital

Sources

• UNESCO and library-science literature on digital preservation programmes (general reference).
• Consultative Committee for Space Data Systems, Reference Model for an Open Archival Information System (OAIS).
• Rewritten from commonly cited encyclopedic summaries; not a verbatim Wikipedia copy.