Digital Preservation
Digital preservation is a formal process to ensure that valuable digital information remains accessible over time as technology evolves. Key methods include bitstream copying, refreshing, and durable media storage, alongside strategies like digital archaeology and data migration. These techniques help combat data loss, deterioration of physical media, and ensure that digital content can be recovered from obsolete systems.
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Digital Preservation
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- 2. Digital Preservation • Digitalpreservation is a formal procedure to ensure that digital information of continuing value remains accessible andusable. • Digital preservation is the method of keeping digital material alive so that they remain usable as technological advances render original hardware and software specification obsolete (Harrod’s Librarians Glossary).
- 3. Methods/Techniques/Strategies • BitstreamCopying • Refreshing •Durable/PersistentMedia Storage • Technology Preservation • DigitalArchaeology • Analog Backup • DataMigration
- 4. BitstreamCopying • Bitstreamcopying iscommonlyknown as“databackingup” • It istheprocess of makingan exactduplicateof a digitalobject. • Bitstreamcopying is nota long-termpreservation technique. • It dealswithdataloss due tohardware and mediafailure. • Bitstreamcopying isoftencombinedwithremotestorage.
- 5. Refreshing • Refreshingis tocopy digital informationfrom long-term storage mediumto anotherof thesame type. • For example,bitstreams may be copied from an old CD/DVD/DAT tape to a newCD/DVD/DAT tape . • Refreshingaddresses theproblem of deterioration of physical storage medium.
- 6. Durable/PersistentMediaStorage • This involvesthe use of long-termstoragemediatobackup the digitaldata. • For example,Gold CDs are usedtoback up datainsteadof ordinary CDs. • Gold is used in place of superaluminiumcommonlyused in ordinary CDs. • Gold CDs have higher resistanceto corrosion. • They are moredurablethanordinary CDs. • This durability ensures long-termstorageofdata.
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- 8. TechnologyPreservation • TP involvespreserving the technical environment that runs the system, including operating systems, original application software, mediadrives, and thelike. • It is sometimescalled the"computermuseum"solution. • This strategy is expensive and hence, cannot be afforded by smallinstitutions.
- 9. Digital Archaeology • DigitalArchaeology involves methods and procedures to rescue content from damaged media or from obsolete or damagedhardware and software environments. • DA is an emergencyrecovery strategy • It usually involves specialized techniques to recover bitstreams from media that has been rendered unreadable, eitherdue tophysical damageor hardware failure.
- 10. Analog Backup • Analogbackupcombines the conversion of digital objects into analogform with theuseof durable analogmedia. • Generally, HD-Rosetta or silver halide microfilms are used to store data.
- 11. HD-Rosetta Disk SilverHalide Microfilm
- 12. Data Migration • DataMigration means to copy data, or convert data, from one technology to another, whether hardware or software, preserving theessentialcharacteristics of thedata. • Data migration may include replication, normalization, canonicalization,emulationor encapsulation.