More duplicate task backup

[Virus_900]

<p><strong><span>Windows 10 Pro Build 19041 EN All update</span><span> KTS 21.1.10.361 EN</span></strong></p>
<p><strong></strong></p>
<p><strong>Reproduction steps:</strong></p>
<ol>
<li>Click to Backup and Restore.<span></span></li>
<li>Create 102 task.</li>
</ol>
<p><strong>Actual result:</strong></p>
<p><span></span>More duplicate task 90.</p>
<p><strong>Expected Result: </strong></p>
<p><span></span>All task create without duplicates.</p>
<p></p>
<p><img src="https://i.ibb.co/4sWYDHG/Annotation-2020-05-20-000902.png" /></p>