Migration is the transferring of data to newer system environments. This may include conversion of resources from one file format to another (e.g., conversion of Microsoft Word to PDF or OpenDocument) or from one operating system to another (e.g., Windows to GNU/Linux) so the resource remains fully accessible and functional. Two significant problems face migration as a plausible method of digital preservation in the long terms. Due to the fact that digital objects are subject to a state of near continuous change, migration may cause problems in relation to authenticity and migration has proven to be time-consuming and expensive for “large collections of heterogeneous objects, which would need constant monitoring and intervention.
Source: Wikipedia: https://en.wikipedia.org/wiki/Digital_preservation#Migration
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