我发现这个过程经常会出现停滞的情况，而且速率较慢，咨询CCB Support后，他们给了如下回复
2019-03-26 09:30:30,373 ERROR - Request failed, retrying in 1600 msec, 1 attempts left
CloudBerryLab.Base.HttpUtil.Light.LightWebException
The underlying connection was closed: The connection was closed unexpectedly.
Please make sure that there are no antivirus / firewall software on the machine or its network environment preventing connections to / for:
TCP ports: 80, 443
Addresses :
- *.s3.amazonaws.com (full list of endpoints can be found here)
Executables: - cbd.exe
- CloudBerryDriveHost.exe
- CloudBerryDriveService.exe
- CloudBerryDriveTray.exe
因此我感觉是Great Firewall的阻挡导致的，因此我改了设定，将EC2建在美国区，用SFTP服务将中国区的数据同步过来，再用CCB传入S3，这样修改后，传输速率大为改观。
- ERROR: Warning. One or more backup paths don‘t exist
Log发给CCB Support后得到如下回复：
2019-02-21 10:02:08,632 WARN - Path is not found: \?\GLOBALROOT\Device\HarddiskVolumeShadowCopy41442\En\Ra\SM\IS\Singlelog\Error\ISP-FAIL_20190221_095154.txt
System.IO.FileNotFoundException
Could not find file ‘\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy41442 \En\Ra\SM\IS\Singlelog\Error\ISP-FAIL_20190221_095154.txt‘.
This error relates to VSS. We suspect that Backup Source "G:\En\" is possibly a mapped EFS Volume, which is essentially a network share.
Unfortunately VSS does not work on network shares, so there are now much that could be done in this case.
One possible workaround would be make sure that there are no users working with the files on this network share, because it may be locked because of this. Try to reschedule the backups to no working hours.
也就是说这个fast NTFS scan不支持EC2 EBS加载的磁盘，而只能是本地盘
原文地址：https://blog.51cto.com/helpdesk/2400594