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Re:Object Storage: AWS vs Google Cloud Storage vs Azure Stor... by zedpm on Tuesday March 20, 2018 @11:04AM (#16629151)
S3 allows you to turn versioning on and off for a bucket; my understanding is that B2 does not.
Re:Object Storage: AWS vs Google Cloud Storage vs Azure Stor... by arghwhat on Tuesday March 20, 2018 @01:36PM (#16630717)
Yeah, that's correct. You have to delete old versions manually after upload if you want to simulate an "overwrite".

It would be quite simple for backblaze to implement, though, so I guess it might come as a future option.