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Re:Object Storage: AWS vs Google Cloud Storage vs Azure Stor... by manigandham on Tuesday March 20, 2018 @12:38PM (#16630168)
Why would you need a separate ID other than the actual filepath key? (and a metadata version number if you have versioning available)
Re:Object Storage: AWS vs Google Cloud Storage vs Azure Stor... by arghwhat on Tuesday March 20, 2018 @01:17PM (#16630545)
B2 doesn't have metadata version numbers, but instead use the globally unique file identifier to refer to specific versions. When you list file versions, you're presented with file ids rather than version numbers.

It's only slightly different from the name+version approach, but I personally like the concept of unique identifiers better. It feels nicer.