Endangered large

Master recordings of radio broadcasts generated live but often poorly stored thereafter, for example offline recordings on single LTO (Linear Tape Open) Tapes

Group: Sound and Vision

Trend in 2021:

Consensus Decision

Added to List: 2017

No change No Change

Previous classification: Endangered


Trend in 2022:


No change No Change


Imminence of Action

Action is recommended within three years, detailed assessment within one year.

Significance of Loss

The loss of tools, data or services within this group would impact on people and sectors around the world.

Effort to Preserve

It would require a major effort to address losses in this group, possibly requiring the development of new preservation tools or techniques.


Broadcast archives of UK commercial local radio;

‘Critically Endangered’ in the Presence of Aggravating Conditions

Lack of archival mandate; lack of capability of archive; lack of policy or capacity within broadcaster; small or unprofitable broadcaster; concern over intellectual property rights; overzealous rights management protection; device or software dependence; dependence on proprietary or obsolete formats; lack or loss of documentation; little use or inaccessibility; storage (typically tapes) older than warranty; lack of media refreshment plan; lack of error or integrity checking process; single copies

‘Vulnerable’ in the Presence of Good Practice

Archival responsibility accepted and acted upon; replication; refreshment of media; good documentation; active in digital preservation community; trusted repository; content re-used

2021 Jury Review

This entry was added in 2017 as a separate entry due to concern over recordings on LTO tapes. These provide between 15 and 30 years’ storage which may be less depending on usage and storage conditions. LTO1 and LTO2, which were released in 2000 and 2003 respectively, have largely reached the final phases of viability. Reader compatibility may be more problematic than media resilience, however. Drives supporting newer releases of the format are typically only compatible within two generations, and experience with the recently released LTO8 suggests that it is only backwardly compatible to one generation. One major national archive and library for instance had decided to expedite migration away from LTO6, which is becoming obsolete more quickly than anticipated. Through time, the risks to collections that have not been refreshed or replicated from early LTO tapes expand. Thus, the overall trend is towards greater risk when collections are not migrated. Older formats, perhaps as recently as LTO6, extinction events should be anticipated within two to five years. The 2021 Jury agreed with the Endangered classification, noting the importance of a selective approach.

Additional Comments

Depending on the legislative context, digital radio recordings may fall under published works if they are broadcasts. Additionally, if the recordings are broadcast by a taxpayer-funded broadcaster, record-keeping guidelines may already exist to advise how long content be kept, which would then inform a selective approach to caring and looking after them for as long as required.

While broadcasters may keep their own programmes, they are often not comprehensively collected or archived by memory institutions as contributions to cultural heritage.

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