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Single-instance storage
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<p>Single-instance storage (SIS) is a system's ability to take multiple copies of content and replace them by a single shared copy. It is a means to eliminate data duplication and to increase efficiency. SIS is frequently implemented in <a href="/facts/File_system/FdPm90uc">file systems</a>, <a href="/facts/E-mail_server/9SJG5sbb">e-mail server</a> software, <a href="/facts/Data/AUBFN97o">data</a> <a href="/facts/Backup/ldV72CkU">backup</a>, and other storage-related computer software. Single-instance storage is a simple variant of <a href="/facts/Data_deduplication/sHuJ8zya">data deduplication</a>. While data deduplication may work at a segment or sub-block level, single-instance storage works at the whole-file level and eliminates redundant copies of entire files or e-mail messages. </p>