What is the difference between a cloud file and a local file?¶

A cloud file is an object managed by a provider; a local file is an item held in a device's filesystem. They may contain identical data and appear under the same name, but each has its own location, identifiers and history.

The two records answer different questions¶

The provider can record an account action without identifying the human user. The device can show local presence without proving that the user created or knowingly opened the content.

One cloud object can have several local representations¶

Dave's OneDrive records object OBJ-4407, version V-12. His Surface Laptop holds a full synchronised copy, his phone holds a thumbnail, and another Windows device lists an online-only placeholder that retrieves the content when opened. All three refer to the same provider object, but only the Surface currently stores the full content.

The reverse also occurs. A downloaded copy can be moved outside the synced folder and edited independently. It may keep the same filename while no longer representing the current cloud version.

Timestamps describe events in their own system¶

A local “created” time may record when synchronisation placed a copy on that device. A cloud “modified” time may record a server-side save. Exporting, restoring or copying the file can create further timestamps without changing when the original content was authored.

This is why cloud and device data should be compared through object IDs, version IDs, hashes, sync records and the event timeline rather than through filenames or one timestamp alone.

State the relationship, not an assumption¶

Useful conclusions distinguish the two sources:

• “The provider retained version V-12 under account C-54119.”
• “The laptop held a full local copy linked to OBJ-4407.”
• “The phone displayed a cached preview; a full local copy was not established.”

None of those statements alone establishes authorship or conscious use.