Backing up servers and workstations to tape can be a cumbersome process, and restoring data from tape even more so. While backing up to disk-based storage is faster and easier, and probably more reliable, it can also be more expensive.
One way to get the best of both worlds is to back up to disk-based storage that uses deduplication, which increases efficiency by only storing one copy of a thing.
While the process was originally used at the file level, many products now work at the block or sub-block (chunk) level, which means that even files that are mostly the same can be deduplicated, saving the space consumed by the parts that are the same.
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