It is very secure to use Wise-Sync.
Wise-Sync is a cloud based integration service that synchronises accounting data between ConnectWise and your cloud accounting package (Xero or QuickBooks Online).
One of our great features is that you do not have to worry about the security of Wise-Sync as we never store any of your data on our server.
For further information please view: FAQ: Do you store any of our financial data.