QB Issue Resolution:

Did you backup your file? You could restore a backup.  It is always recommended to backup and save to Dropbox or a USB stick or something other than your computer.

If not, you could check with your accountant to retrieve prior year records (if you sent them a file).

You could redo your year by downloading via online banking all transactions from checking and credit cards.

Resolution for Issue 'computer hacked lost all info for QB 2016 had 2 seperate accounts. I was able to retreive1 of my companies info, but not the other. I have used since 2010. What do I do?' available: Yes (Solved).
Source: Intuit Community forum.

computer hacked lost all info for QB 2016 had 2 seperate accounts. I was able to retreive1 of my companies info, but not the other. I have used since 2010. What do I do?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for companies info
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