@Swahela Mulla,Thanks for posting in Q&A.
From your description, I know that you want to monitor the backup status and the percentage of endpoints successful backups via PowerShell.
For the issue, could you please confirm that if you installed and imported the IntuneBackAndRestore module, if yes, based on my researching, I found that there is not related command to check Intune Backup Status.
We suggest that you ask help for @John Seerden in the link below.
https://github.com/jseerden/IntuneBackupAndRestore
Thanks for your kind understanding.
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