Reference IDs and Snapshot Limitations
Each item included in a snapshot has a reference ID which is unique to the item it references. It is not a path or an alias. (Both would consume too much space, and neither would allow the level of tracking desired.) The same item copied to a different volume will have a different ID. If an item is replaced with a copy of itself, the copy will have a different ID than the original. This allows for detailed tracking of a volume's contents. However, as a direct consequence, it is not possible to compare the contents of different volumes or even different folders on the same volume since there can be no matching IDs in those cases. |
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