A Windows update that prevents Windows Backup from appearing on certain user interface (UI) screens for certain editions of Windows 10 and Windows 11 has been released. This update prevents Windows Backup from appearing in the “All apps” and “Installed apps” lists for Enterprise users, domain-joined users, guest users, and users whose Microsoft accounts have been restricted by policy. When you install a Windows security update that was released on or after January 25, 2024, the Windows Backup app does not appear on an Enterprise-managed device.
This explains why the unwanted icon just recently disappeared from my start menu.
I never wanted it anyway.