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Cumulus is a system for efficiently implementing filesystem backups over the Internet, specifically designed under a thin cloud assumption—that the remote datacenter storing the backups does not provide any special backup services, but only a least-common-denominator storage interface. Cumulus aggregates data from small files for storage and uses LFS-inspired segment cleaning to maintain storage efficiency. While Cumulus can use virtually any storage service, we show its efficiency is comparable to integrated approaches.
Vrable et al. (2009) studied this question.
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