71–72 of 72 posts
For about the last year or so I've been looking for an online backup system with the following requirements: - Off-site storage, preferably not costing too much. - Option for on-site storage (e.g., to store a backup "in the cloud" and on my NAS) - Keeps version history, with the associated goodies (purging old backups, etc) - Able to run on FreeBSD and Linux, with Windows and MacOS being nice to have but not required…
Some claims: "It is the only cloud backup tool that allows multiple computers to back up to the same storage simultaneously without using any locks (thus readily amenable to various cloud storage services)" "What is novel about lock-free deduplication is the absence of a centralized indexing database for tracking all existing chunks and for determining which chunks are not needed any more. Instead, to check if a chun…
Naming chunks by their hashes is not a new idea, but this technique along does not give you a practical backup tool. The deletion of unreferenced chunks becomes a hard problem, and the center piece of lock-free deduplication is the two-step fossil collection algorithm that solves this hard problem.