介紹BitTorrent Sync
這是利用B2B技術來將私有裝置的檔案同步的功能，不透過網上的雲端硬碟，可以達到快速並安全的效果。缺點是裝置必須開啟才有辦法同步取得資料。
所以我想到的運用是將我的rpi接上外接硬碟，備份檔案至硬碟，也可以是Apple的Time Machine。
安裝BitTorrent Sync
Pi -Terminal
安裝
$ wget https://download-cdn.getsync.com/stable/linux-arm/BitTorrent-Sync_arm.tar.gz
執行畫面
converted 'https://download-cdn.getsync.com/stable/linux-arm/BitTorrent-Sync_arm.tar.gz' (ANSI_X3.4-1968) -> 'https://download-cdn.getsync.com/stable/linux-arm/BitTorrent-Sync_arm.tar.gz' (UTF-8)
--2016-08-07 23:16:46-- https://download-cdn.getsync.com/stable/linux-arm/BitTorrent-Sync_arm.tar.gz
Resolving download-cdn.getsync.com (download-cdn.getsync.com)... 54.192.127.218, 54.192.127.148, 54.192.127.13, ...
Connecting to download-cdn.getsync.com (download-cdn.getsync.com)|54.192.127.218|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5257229 (5.0M) [application/x-tar]
Saving to: 'BitTorrent-Sync_arm.tar.gz'
BitTorrent-Sync_arm.tar.gz 100%[=======================================================================================================================>] 5.01M 1.58MB/s in 4.0s
2016-08-07 23:16:51 (1.25 MB/s) - 'BitTorrent-Sync_arm.tar.gz' saved [5257229/5257229]
新增資料夾(安裝位置)
$ mkdir ~/btsync
btsync 為資料夾名稱，可以自訂
解壓縮
$ tar -xvf BitTorrent-Sync_arm.tar.gz -C ~/btsync
執行畫面，解壓出三個檔案
LICENSE.TXT
README
btsync
開啟btsync資料夾
$ cd btsync/
閱讀
$ vi ./README
內容片段
...
After extracting this tarball, just run:
$ ./btsync
to start the Sync daemon.
Then go to localhost:8888 in a web browser to access the WebUI.
IMPORTANT NOTE:
To improve security, the LAN listening interface is off unless you configure it.
By default the WebUI is only accessible on the computer running Sync
(localhost:8888). In order to have the WebUI accessible across the
LAN, use a configuration file or start Sync this way:
$ ./btsync --webui.listen 0.0.0.0:8888
...
得知開啟的方法
跳出vi，請輸入括號內紅字 ':quit'
在btsync目錄下，輸入(白字部分)
~/btsync $ ./btsync --webui.listen 0.0.0.0:8888
執行畫面
By using this application, you agree to our Privacy Policy, Terms of Use and End User License Agreement.
https://www.getsync.com/legal/privacy
https://www.getsync.com/legal/terms-of-use
https://www.getsync.com/legal/eula
Webui is listening on 0.0.0.0:8888
如果是輸入
~/btsync $ ./btsync
則執行畫面
By using this application, you agree to our Privacy Policy, Terms of Use and End User License Agreement.
https://www.getsync.com/legal/privacy
https://www.getsync.com/legal/terms-of-use
https://www.getsync.com/legal/eula
Webui is listening on 127.0.0.1:8888
差異是前者可以使用遠端如上一篇的ssh操作，而後者只能本機操作
本機操作方法為開啟網頁輸入 0.0.0.0:8888 or 127.0.0.1:8888
Mac端SSH連線開啟畫面如下
網頁輸入'http://[hostname].local:8888/gui/'
我本身的例子是:http://rpi3-1.local:8888/gui/
安裝好之後的操作可以參考這裡
版本差異 here
免費版無法使用加入裝置的方式
參考：
http://blog.itist.tw/2015/07/using-btync-to-sync-files-between-all-your-devices.html
https://free.com.tw/bittorrent-sync/
https://getsync.com
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