digital data preservation
TRANSCRIPT
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DigitalData
Preservation
Abhishek Singh Aditya Dhanraj
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What is Digital document
preservationData preservation, or more specifically,
digital data preservation, refers to the
series of managed activities necessaryto ensure continued access to digital
materials for as long as necessary.
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Need for digital preservation
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Need for digital preservation
Media issues:
urrently magnetic or optical tape and disks, some
devices !e.g., memory sticks"
#$amples include: D%&'M, D(D !optical", DA),D*) !magnetic"
+nknon lifetimes
Subject to differences in -uality or storage conditions
ut relatively short lifetimes compared to paper or
good -uality microform
/robably years rather than decades
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Digital preservation: issues
data is maintained in the repository ithout
being damaged, lost or maliciously altered0
data can be found, e$tracted and served to auser0
data can be interpreted and understood by
the user0 and
the above can be achieved in the long term.
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SHPT School of Library Science
Digital preservation process
'rganisational
Managerial and
)echnical
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'rganisational issues:
digital preservation policy 1ustification for preservation 'rganisational and financial commitment
/reservation of authentic resources and-uality control
Metadata creation 2igh%level identification of roles and
responsibilities )raining and education
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Managerial issues
preservation planning
developing strategy
taking sole responsibility for
preservation
dealing ith 3) staff or e$ternal
preservation service providers
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Methods of digital preservation
itstream opying
Durable, /ersistent Media
Standards Migration
#mulation
#ncapsulation
/reservation Metadata
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Bitstream Copying
4 or backing up
data, here you
make a duplicateof the digital object. Durable, PersistentMedia 4 here youpreserve the
physical media,
or D, on hich the
object is stored.
Migration 4 here you
copy data from one
technology to another toavoid obsolescence of
both the physical media
and the data format.
Standards 4 relies
on recogni5ed, long%
term standards over
proprietary formats.
Emulation 4 process ofreproducing softare and
hardare
environments to translate
code from one computing
environment to run
on another.
Encapsulation 4 as
part of an emulation
strategy, here objects
andmetadata are grouped
together to help decode
and render object later.
Preservation Metadata
4 describes the
softare, hardare and
re-uirements of the
digital object to use in
preserving the object.
Preservation
strategies
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)echnology emulation
/reserving the original bit%streams and application
softare0 running this on emulator programs that
mimic the behaviour of obsolete hardare
#mulators change over time haining, rehosting
#mulation (irtual Machines
&unning emulators on simplified 6virtual machines6
that can be run on a range of different platforms (irtual machines are migrated so the original bit%
streams do not have to be
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enefits:
)echni-ue already idely used, e.g. for emulatingdifferent hardare, computer games
/reserves the original bits
&educes the need for regular object transformations !but
emulators and virtual machines may themselves need to
be migrated" &etains 7look%and%feel8
May be the only approach possible here objects are
comple$ or dependent on e$ecutable code
*ess 6understanding6 of formats is needed0 little
incremental cost in keeping additional formats
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3ssues:
Which organisations have the technical
skills necessary to implement the
strategy9
/reserving 6look and feel6 may not beneeded for all objects
3t ill be difficult to know definitively
hether user e$perience has been
accurately preserved
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onclusions:
/romising family of approaches
eeds further practical application and
research
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1 BBC ne!s via "E #$%1 on !indo!s
3lye ;reymars oldeb.today emulates range of brosers
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challenges of digital
preservation )echnology obsolescence
Absence of established standards,
protocols, and proven methods forpreserving digital information
technological or economic feasibility of
operating on a mass scale
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Thank You !!