If your connection is interrupted, ZCB will immediately begin to actively retry the upload, and will continue to retry for approximately 11 minutes. After that time, the upload will be marked as failed on the Report page.
However, ZCB will continue to retry the failed upload in a more passive manner. The exact behavior depends on which version of Windows is installed.
For Windows XP or 2003
ZCB will attempt to resume the upload once every hour.
For Windows Vista and newer
The upload will resume automatically when ZCB detects a network connection.