The mysterious Mac problem that's hogging up your storage could be snapshots
Macworld The mysterious Mac problem that’s hogging up your storage could be snapshots Snapshots for volume backups are often the culprit. body> Over 200GB had disappeared from my Mac's startup volume. It seemed unlikely the external SSD I had just swapped in as my startup drive was shrinking. Instead, it was a snapshot—more accurately, a snapshot for reverting the state of files on my volume or the entire volume to a previous point in time. Snapshots are a powerful way for backup software to provide a quick point in time to walk back to when you don't necessarily need to rest...
Source: pcworld.co.nz