By default, QuickBooks has the facilities to backup company data files and data, to save your data from any accidental loss or damage. Sometimes you may see Quickbook unable to back up company file error, to fix this error there are two methods to try. 1st step repairing the company files, sometimes the company files get affected. 2nd step avoids overwriting an existing file. 3rd step run the Verify? Rebuild utility tools, this works as manual repair, and the 4th step backup your company files to an external drive or flash drive. In case you need expert advice then you contact our QuickBooks support team (844)-932-1139.