It is important to develop realistic expectations when planning a backup architecture. This section discusses potential areas of confusion in the planning that could result in a disproportionate number of problems.
Data compression has two effects. It speeds up the effective data transfer rate, and it compacts data written to tape, enabling the tape to hold more information.
Compression can be problematic for a number of reasons. The benefits of compression vary, depending on the type of data to be compressed and the compression mechanism used. When the same compression algorithm is used, different types of data compress to different degrees. The level of compression depends on how much redundancy can be identified ...