A archivology has a study object in digital preservation proposing standards, norms, policies, criteria and procedures for digital preservation. In order to be able to know the theoretical and methodological approaches that have been published, a collection of bibliographic reference data on the subject of preservation of digital documents in archives, mainly looking for recent texts linked to archivology. Documents become digital quickly due to the vulnerability of the digital environment. These are fragile and there is insufficient security to ensure their long-term digital preservation. Such fragility may be in its rapid physical degradation, technological obsolescence, complexity and costs. As a response to this challenge, digital preservation strategies are emerging that seek to incorporate all aspects related to this issue: costs, legislation, management, access, policies and criteria. These strategies bring together partial solutions to a complex problem, involving, among other things, migration, emulation, digital archaeology, cryptography, metadata, free technologies, or open such as XML, HTML, Dublin Core. This descriptive search showed that digital preservation is related to the ability to store, migrate and disseminate information that is most often administered centrally. To address this issue, there are several proposals for digital preservation today. These include: Refreshing; Migration; Migration to analogue media, Version Update; Conversion to competing formats; Standardisation; Migration on demand; Distributed migration; Emulation; Encapsulation; 4.1.5 Digital Rosetta Pedra; Digital archaeology; Hardware and software conservation; Free or open technologies such as XML, HTML, PDF-A; Reprography. Of the preservation strategies presented, it should be noted that migration together with emulation are the most developed and used strategies, Ferreira (2011).