Error 2277 in QuickBooks backup is usually caused by a partial or wrong backup of the company files. But there are other factors that can cause this error code in QuickBooks. Read the blog to learn about the various fixes to troubleshoot QuickBooks error 2277. Causes behind QuickBooks Error 2277 • Deleting QuickBooks files inadvertently. • Windows Firewall is not allowing the connection between the server and QuickBooks. • Accumulation of temporary and system junk files. • Intuit isn't added to the list of trusted sites.