System data occupied more than 140G space after upgrade to beta1

[younker]

After upgrade to Monterey beta, I found my available space is reduced dramatically, then I open the storage panel from About my Mac and then I saw a category named "System Data" that occupied more than 140G space. What are these system data and how can I remove them or reduce the size of it?

And now the number is over 152GB as I have deleted some files from the downloaded folder and application support folder. Weird.

 

[younker]

Now the number increased to 160G, and no one else has such issue?
See the last item in the attached screenshot.

 

[mdgm]

Could that be local snapshots for Time Machine?

 

[vbctv]

It's likely iCloud space used. I have all my 200GB of iCloud files downloaded in my MBP and it's showing as System Data instead of iCloud on beta 1. I have reported it to Apple already.

 

[younker]

Could that be local snapshots for Time Machine?

No, I don't have time machine enabled.

 

[younker]

It's likely iCloud space used. I have all my 200GB of iCloud files downloaded in my MBP and it's showing as System Data instead of iCloud on beta 1. I have reported it to Apple already.

I am a free user of icloud and the space occupied by icloud storage should not be more than 5G. but the system data size seemed keep increasing.