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That does not explain the purgeable data calculation problem and its' relation to Apple Intelligence. This screenshot seems to be quite old posting from somewhere.
 
Well there is at least some progress to this purgeable data problem - update to 15.5 did not increase this amount while every previous one did...
 
Sequoia's disk space measurements are a hot mess. My 2TB SSD was starting to get tight on space. It was down to around 150GB left so I started doing some spring cleaning. The only problem is that despite purging a lot of old files, my storage space just kept going down.

It was down to 30GB earlier today so I took some aggressive measures and nothing happened. Well, it turns out that the key issue was that I had some problems with my Time Machine snapshots.

If you use Time Machine and it seems like you only lose more disk space the more you tidy up, you may have had the same issue too. Here's some info about that:
 
Sequoia's disk space measurements are a hot mess. My 2TB SSD was starting to get tight on space. It was down to around 150GB left so I started doing some spring cleaning. The only problem is that despite purging a lot of old files, my storage space just kept going down.

It was down to 30GB earlier today so I took some aggressive measures and nothing happened. Well, it turns out that the key issue was that I had some problems with my Time Machine snapshots.

If you use Time Machine and it seems like you only lose more disk space the more you tidy up, you may have had the same issue too. Here's some info about that:
Its getting worse then I thought, several Macs here, all m1, all Sequoia, latest update, now even after removing 50GB of space on the internal SSD Disk Utilities shows zero change, its like the Mac decides what space is available, no math, no counting, as if its designed to purposely over write files with out your awareness or consent and your responsible not Apple or the OS, why would Apple allow such thing to go so long?
 
its like the Mac decides what space is available, no math, no counting, as if its designed to purposely over write files with out your awareness or consent

Try using something like OmniDiskSweeper to do a live accounting of your disk space. I’ve found that tool to be handy many times over to help me discover where the files are piling up.

It’s not always MacOS’s fault. I once forgot that I left a logging utility running and after 1 year, the log file was around 350GB!

Something went sideways as of Sequoia. I really don’t trust whatever free space number is being reported. I just assume that it’s about 10% off and act accordingly.
 
Try using something like OmniDiskSweeper to do a live accounting of your disk space. I’ve found that tool to be handy many times over to help me discover where the files are piling up.

It’s not always MacOS’s fault. I once forgot that I left a logging utility running and after 1 year, the log file was around 350GB!

Something went sideways as of Sequoia. I really don’t trust whatever free space number is being reported. I just assume that it’s about 10% off and act accordingly.
heart tip, I need something to tell me whats actually there lol, thanks!
 
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heart tip, I need something to tell me whats actually there lol, thanks!

In that case, the download link is here:

It's free software and I run it every few months just to make sure I don't have a large cache of obsolete files I forgot about.
 
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