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This would indeed be true for a sufficiently large price advantage of Glacier over S3, but note that tarsnap typically saves ~99.99% by de-duplicating my data (
by JoachimSchipper 14y ago
This would indeed be true for a sufficiently large price advantage of Glacier over S3, but note that tarsnap typically saves ~99.99% by de-duplicating my data (daily backups, usually only a few e-mail and code files have changed.) I imagine that the typical usage pattern may be a bit less extreme, but the price differential would have to be huge to be worth it.
- wmf 14y agoWhen calculating dedupe ratios you should be careful what baseline you use. Performing full backups every day is generally not realistic. I would compare dedupe-based systems against classical incremental backups.
- ghshephard 14y agoI don't know if only sending the changes is considered "De-Duping" (though it is related) - That's more equivalent to doing differential (or block level differential) backups. De-Duping is if you add the same file (or portions of a file) in 10 different directories - the data is only stored once in backups. Dropbox takes it a step further - if 1,000 people store the xcode DMG on their dropbox store, only one copy is stored in Dropbox.
- cperciva 14y agoI don't know if only sending the changes is considered "De-Duping" (though it is related) - That's more equivalent to doing differential (or block level differential) backups. The way Tarsnap does things, it's the same thing; Tarsnap splits data into blocks and deduplicates those blocks without caring whether each block is a whole file or part of a file or several small files stuck together.