However, the backup process is continuous and therefore there is always a certain amount of disk space that is locked by macOS for the snapshots. Eventually when the snapshots get transferred to the permanent storage, such as the Time Capsule, or as the snapshots become too old and get replaced by newer ones, macOS releases the disk space. The reason for this problem is that macOS is making temporary backups of the system, so called local snapshots, temporarily locking big amounts of disk space in an area of the disk that is fully opaque to the users. A quick scan in DaisyDisk typically reveals a big chunk of " hidden space", which means the system is using more disk space than it’s possible to reveal by scanning, even with elevated permissions ( scanning "as Administrator").
Ever since macOS Catalina was introduced, many Mac users noticed that their disks eventually get full without obvious reason.
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