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Is it possible to create a Time Machine backup profile that limits the backup size depending on the clients storage. For example, if a Mac has 512gb storage I want to limit their backup size to 1TB but if they have 2TB storage I want to limit them to 4TB. Obviously I could create groups based on device storage size and apply a different config to each group. But I’m wondering if there’s some formula I could enter in the “Backup Size Limit” field or some other method to achieve this nicely. Thanks!

Time Machine is not an enterprise tool and as such apple does not offer many MDM management options for it. However, you may be in luck on this one as apple has a BackupSizeMB key.

 

 

https://developer.apple.com/documentation/devicemanagement/timemachine