When syncing each file, Dropbox checks to see if any of the hashed blocks recorded on the blocklist are missing. We’ll also go into why some services don’t use it, and what this all means for you.īy only uploading the parts of a file that has changed, transfer times can be reduced to fractions of what it would be to update the entire file. In this article, we’ll discuss the basic mechanics behind block-level copying, then talk about some of the cloud storage and online backup services that use this technique. Even if you just use cloud storage for personal files, faster syncing lets you upload files in a hurry and access them from other devices sooner.Īlthough block-level sync is faster than its alternatives, it’s still mainly used by Dropbox and OneDrive, which appear to have perfected the technology in a way competitors struggle to copy. The faster your sync speeds, the closer you can get to sharing real-time updates. Sync speeds are a big deal, particularly if you use cloud storage to collaborate with your coworkers. The latter should not be confused with differential backup, which refers to backing up select files from a whole device or drive.
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