The difference between Exchange Server backups and archives How does the retention of backed up Microsoft Exchange Server data differ from that of archived data?
Unfortunately, the answer depends a lot on the context. In general, when someone says “backup retention policies,” they are referring to a backup application’s definition of a retention policy, which is typically established at the backup media level. Fundamentally, if a backup tape is created and managed by the backup application, the backup retention defines how long Exchange data on a given tape or tapes will be preserved prior to being eligible for tape overwrite, and therefore data removal. In this model, after the retention period of the media has expired, the backup media space is made available for overwrite; new Exchange Server backups (tape recycling) can then use the same media. In most implementations, if the tape is not present in the tape loader, or is set up to prefer new media first, expired tapes are never overwritten, and data can be accessed by scanning or cataloging the tape data. A variation on this theme is that each backup session is given a specific retention pe
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