BitTorrent Sync - unlimited space, P2P sharing

BitTorrent technology can realize the direct sharing of files between multiple points, and the more people upload and download, the faster the speed. What "BitTorrent Sync" wants to do is to use this technology on the most popular network synchronization today to achieve personalized private file synchronization and sharing .
"BitTorrent Sync" emphasizes direct file synchronization between multiple computers through network connections, direct folder synchronization between you and your friends, files do not need to be uploaded to any cloud system, the transmission process is even encrypted for you, and there is no limit on file size or storage capacity (in other words, you can transfer files as large as your hard drive).

In simple terms, the file is stored somewhere unknown, and a unique identifier is generated for the file. The unique identifier can be downloaded from any place with internet access.
The difference between BitTorrent Sync and the commonly mentioned network disk:

• First point: How to transfer files?
  Dropbox stores files in the cloud in real time, so you can shut down your computer after use, and any computer can be synchronized immediately after it is turned on, because the files are downloaded from the cloud.
  BT sync does not store files in the cloud, but uses an Internet connection to transfer files directly between computers. The computer that has the files must be turned on in order to transfer the files to the new computer.
• Second point: Usage restrictions?
  Everyone must have a Dropbox account to share files synchronously.
  BT sync requires everyone to install the software and obtain the key from each other before transferring files.
• Third point: Transfer size limit?
  Dropbox has a total storage size limit, but there is no limit on a single file.
  BT sync determines the file storage limit based on the hard disk size, and there is no limit on a single file.
• Fourth point: Which folders can be synchronized?
  Dropbox can only sync one specific folder on your computer.
  BT sync can synchronize multiple folders in any computer.
• Fifth point: How private is sharing?
  Dropbox allows you to share files with other Dropbox users and authorize them to modify the contents of the synchronized folders.
  BT sync can also authorize the other party to only read or modify the synchronized folder, and there is an additional limit for authorization to 24 hours.

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BitTorrent Sync: http://labs.bittorrent.com/
Partially taken from: http://playpcesor.blogspot.com/2013/04/bittorrent-sync-bt-dropbox.html