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Background
The bulk of local studies and archive holdings have so far been received in traditional formats, such as paper, parchment and photographic material, and this may well continue indefinitely. However, an increasing quantity of decisions and transactions are now being recorded in electronic format thus creating digital records to transfer to Local Studies and Archive collections. In addition to these so-called ‘born digital’ records are digital copies of hard copy originals, but these are being created as facsimiles to enhance access and should not be seen as a substitute for maintaining the original.
The challenges of digital preservation centre on how best to preserve not only the information itself long-term, but also its associated evidential value, without which it is not necessarily worth preserving. Challenges include: the rapid obsolescence of hardware, software and storage media.
Services should seek to create a digital preservation strategy to address both short-term and long-term solutions to these challenges.
Examples of digital material and their sources
Transfers from your own local authority departments mainly relate to archives and records management, for example, databases in a variety of formats, CAD drawings, Microsoft Office documents, spreadsheets, e-mails and so on. Some of these records will be held in other software packages such Sharepoint; some on network drives. Neither Sharepoint nor network drives are suitable for long-term storage of electronic archives (i.e. records selected for permanent preservation), due to limitations on space, obsolescence of software formats, and problems caused by staff accessing out-dated information.
Acquisitions from many and varied external sources, including other local authorities, official organisations, groups and individuals, can include: e.g. digital photographs, millennium scrapbooks, e-publications and so on.
Records created in-house as accessible surrogates for use in and beyond the local studies library for example the TIFF and JPEG digital photographs created as part of projects.
Audio-visual material kept in digital form, such as cinefilm or sound recordings which have been transferred to DVD or CD.
Preservation of electronic records
Short term strategies
Some of the fundamental challenges for Local Studies collections and Archives include:
- Preserving not only raw data – the ‘bits’ – but also the contextual information (metadata) vital to their interpretation.
- Preventing tampering or distortion (whether deliberate or accidental), in order to give evidential value to the electronic data, which will act as the modern equivalent of the seal or the signature on a hard-copy record.
- Inability to access material, whether through media failure, lack of compatible hardware or lack of compatible software, especially for complex specialist software such as CAD drawings etc.
Ideally a digital preservation system should be considered. Without this there is no guarantee that records once received by the Local Studies collection or Archive will have the necessary audit trail of access and usage required for legal admissibility and historical authenticity.
In the absence of a reputable digital preservation system an interim policy might be to copy records from portable storage media onto the relevant dedicated read-only drive where they can be backed up by the corporate back-up system, but this is purely a short-term solution as it will not tackle the evidential value issues mentioned above. However, this does not address the needs of more complex digital records such as databases or websites.
The portable media on which the records were received should be kept short-term to give access to them for the public, but they will not be able to be kept permanently in that format due to obsolescence of hardware and software.
For digital records created by the local studies library gold-quality DVDs should be used and stored in optimal temperature and humidity conditions, (18-22 degrees centigrade, 35-45% RH), but again this cannot guarantee longevity beyond 25 years.
Longer term strategies
Investment is required by a parent authority or usually an archive service in a digital preservation system which can manage the complex needs of digital records and ensure their integrity and authenticity over time. The system needs to comply with the ISO standard Open Archives Information System (OAIS) model for the acquisition and storage of digital records and to facilitate public access to electronic archives via the internet. Such a system will ensure that when records are received into the system (ingest) metadata is captured to help with their long-term interpretation, and that once ingested the records can be monitored to ensure they have not been damaged or tampered with. Public inquiries such as the Hillsborough disaster inquiry show how important such transparency and reliability of record-keeping is. The system will also flag up when record formats are becoming obsolete and suggest pathways for onwards migration.
There are various solutions now available on the market which could fulfil these requirements. Most also have a secure public front end. This is important for public access and it means that the public do not need to have access to your organisation’s internal systems to access relevant information. For local studies libraries it is worth considering whether your archive service or parent authority has invested in a digital preservation system and if so, how might you be able to contribute to the content?
Recommended formats
For images, it is recommended to use TIFFs (for master copies) and JPEGs (for access copies). For audio files it is recommended to use WAV files (for master copies) and MP3 or MP4 (for access.)
For other documents, Microsoft formats are recommended at present, as this is usually a preferred supplier, but this should be discussed with relevant ICT teams. Therefore, any upgrade or change could be managed as part of work on other organisational files.
Adobe Acrobat files can be read by many systems, too, and this format may be useful for preserving e-publications.
Examples of formats which are unsuitable for long-term preservation are proprietary software, e.g. family history programs. This is because the information value doesn’t warrant the expenditure required to monitor and migrate a large number of very specific programs for which only a limited number of examples may be held. The results could be rendered in an alternative format, for example Adobe, if necessary.
Disaster Recovery
In the short-term it is the responsibility of your organisation’s information management team to ensure that electronic records held in the Local Studies and Archive service’s network storage folders can be restored from back-ups where needed, and to use systems to make sure there is more than one copy of every record. In the long-term a future digital preservation system may exist off-premise (e.g. in Cloud storage) and it will be the responsibility of the supplier to ensure that there are adequate disaster recovery procedures.
Preservation of records held elsewhere
Local Studies libraries should encourage good practice and provide advice to owners of digital archives on the care of their digital records. If you do have access to a digital preservation system it is always worthwhile enquiring if owners of large digital records could consider contributing to the costs.
Further information:
There is much guidance on the National Archives website: Preserving digital collections – The National Archives
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