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> Which means you can use it to .... or run your own backups

You could, but if i read correctly (s3fs-fuse limitations): "random writes or appends to files require rewriting the entire file".

So changing 1 bit of a 10GB file, means re-uploading 10GB.

This changed in 1.86 and I updated the README as follows:

> random writes or appends to files require rewriting the entire object, optimized with multi-part upload copy

Now changing one bit means re-uploading 5 MB, the minimum S3 part size.

Only if the blackblaze implementation supports put byte range... Not supported by default.