There old temp files from backups that didn’t clear out themselves. You can get rid of them.
Resolution for 'backups issue: 'why so many yymmddAA.log files?' available: Yes.
The backups 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 backups issue yourself by looking for a resolution described in the article. If it is a complex backups issue or you are unable to solve the issue, you may contact us by clicking here or by using other backups support options.
For more information about resolving issues related to backups in Quickbooks/QBO or to get support for the issue 'why so many yymmddAA.log files?', click the link below: