Please note that this is a false positive and Symantec is erroneously flagging our new SyncBack releases due to a low reputation score (as a result of previous false positive reports).
It does not mean the software contains a virus, malware, etc. but simply means Symantec detection system automatically flags our program based on the results of past false positives reports, which inadvertently increased our program's reputation score such that Symantec labelled our SyncBack programs as false positive.
We are working with Symantec to white-list every new SyncBack release and to remove our program from their false positive list.
You can read more about it here:
2BrightSparks takes the threat of infected programs very seriously and does not distribute software that contains viruses or malware: