If you read the article, you don't have to assume (incorrectly) that the client sends the whole file for each backup. Indeed, a significant motivation is to avo

If you read the article, you don't have to assume (incorrectly) that the client sends the whole file for each backup. Indeed, a significant motivation is to avoid sending very large files across bandwidth that is constrained (or costly) on the client side. > I currently have about 1500 such archives stored. Instead of uploading the entire 38 GB — which would require a 100 Mbps uplink, far beyond what Canadian residential ISPs provide — Tarsnap splits this 38 GB into somewhere around 700,000 blocks, and for each of these blocks, Tarsnap checks if the data was uploaded as part of an earlier archive.