QB Issue Resolution:

intuit keeps your account live for one year after you cancel, then it is gone forever

there is no user back up file for QBO either

Resolution for Issue 'Singapore Companies Act requires 5 years of accounting records to be kept. How long are the data kept by Quickbooks? Are the data replicated or sent to an alternate site?' available: Yes (Solved).
Source: Intuit Community forum.

Singapore Companies Act requires 5 years of accounting records to be kept. How long are the data kept by Quickbooks? Are the data replicated or sent to an alternate site?: 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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