Because of the random access nature of disk devices, it also enables multiple concurrent write (backup) sessions. While this is also possible with tape devices, it often involves "data interleaving", which can introduce a performance penalty during subsequent read (restore) sessions.
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The introduction of lower cost disk technology (i.e.: SATA) is also making disk-based backups increasingly popular. Of course, these are only some of the advantages. There are also disadvantages to disk-based backups. As mentioned on numerous occasions, offsite storage represents one of the biggest challenges facing disk-based backup users.
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