Scheduled tasks start 6 hours late

Issue: Two scheduled tasks set to start at 11:30pm both started at 5:30am, the next morning. Looking for a reason why this might happen. Perhaps something related to time zones?

Background:

This is regarding the home version of W10.

I have two scheduled tasks. FYI they make backups for my computer - one for changes and one to mirror all files under \users\folder.

These ran successfully for years on my old computer and I just setup these same tasks on a new one.

I am in US Eastern timezone (+5:00).

Resources:

I attached the XML file of one task. I edited it to anonymize the Author (\computer name\account), and UserID.

Sorry - don't have scheduler history. Forgot to activate it until today.

Also:

Bonus points if you can also tell me why these tasks took 3 hours to complete when they typically took minutes on the older and MUCH slower computer.

Thank you!

PS - Sorry if I posted this to the wrong forum.  I posted it to answers.microsoft.com but was told I should post it in docs.microsoft.com and then I found techcommunity.microsoft.com.  I am not a professional; just a home user hope to get some advice.

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<?xml version="1.0" encoding="UTF-16"?>

<Task version="1.4" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">

  <RegistrationInfo>

    <Date>2021-10-03T10:12:06.1982993</Date>

    <Author>COMPUTERNAME\ACCOUNT</Author>

    <URI>\BACKUP-Mirror</URI>

  </RegistrationInfo>

  <Triggers>

    <CalendarTrigger>

      <StartBoundary>2021-10-03T23:30:00</StartBoundary>

      <Enabled>true</Enabled>

      <ScheduleByDay>

        <DaysInterval>1</DaysInterval>

      </ScheduleByDay>

    </CalendarTrigger>

  </Triggers>

  <Principals>

    <Principal id="Author">

      <UserId>S-1-1-11-111111111-111111111-111111111-1111</UserId>

      <LogonType>S4U</LogonType>

      <RunLevel>HighestAvailable</RunLevel>

    </Principal>

  </Principals>

  <Settings>

    <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>

    <DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>

    <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>

    <AllowHardTerminate>true</AllowHardTerminate>

    <StartWhenAvailable>true</StartWhenAvailable>

    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>

    <IdleSettings>

      <StopOnIdleEnd>true</StopOnIdleEnd>

      <RestartOnIdle>false</RestartOnIdle>

    </IdleSettings>

    <AllowStartOnDemand>true</AllowStartOnDemand>

    <Enabled>true</Enabled>

    <Hidden>false</Hidden>

    <RunOnlyIfIdle>false</RunOnlyIfIdle>

    <DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>

    <UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>

    <WakeToRun>false</WakeToRun>

    <ExecutionTimeLimit>P1D</ExecutionTimeLimit>

    <Priority>7</Priority>

  </Settings>

  <Actions Context="Author">

    <Exec>

      <Command>C:\BackupTools\MirrorBackup.cmd</Command>

    </Exec>

  </Actions>

</Task>