QB Issue Resolution:

The backup routines are not clearing out their own temp files. You can delete them. It has been reported.

Resolution for Issue 'Why is Quickbooks outputting a text file with the day’s date, and AA? (i.e. 160729AA.txt was created on 7/29/2016) it’s located in the same folder as the company file.' available: Yes (Solved).
Source: Intuit Community forum.

Why is Quickbooks outputting a text file with the day’s date, and AA? (i.e. 160729AA.txt was created on 7/29/2016) it’s located in the same folder as the company file.: 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.

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