Settings & keep-time · Keep-time and retention
How far back does Storage Studio's storage history go?
Short answer: About a year. A daily record of drive usage is kept for roughly 365 days to feed the charts, and older days are dropped automatically.
Storage Studio records your drives' usage once a day and keeps about a year of these daily records, which is what the storage charts draw from. Older days are dropped automatically so the history stays small.
The record contains space figures, not your files. If charts look out of date, check the Daily storage snapshots row in Settings → Services.