The SAS PROC COPY procedure is used for this purpose -- specifically to make a back of the entire SAS data library, typically to be used for recovery purposes, as needed. Other approaches, such as using a DATA step to "duplicate" your production SAS database table(s) is somewhat short-sighted and may not satisfy a complete and effective recovery scenario.
Also, consider that your D/R (backup and recovery) approach is going to be influenced by the availability of technical (data storage, scheduling, staffing) resources, as well as your operating environment (platform). This topic must be considered from a data management level, rather than at the lowest (SAS data table/index) level, frankly, if it is to be considered seriously for an enterprise data warehouse / repository initiative.
Scott Barry
SBBWorks, Inc.
SAS.COM support site http://support.sas.com - technical paper references on this topic:
http://support.sas.com/resources/papers/sgf2008/recovery.pdf
http://support.sas.com/rnd/papers/sgf07/sgf2007-iosubsystem.pdf
http://support.sas.com/documentation/onlinedoc/spds/admin443.pdf
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