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Having to know the SHA1 in advance would be a show stopper for rclone ( http://rclone.org ) as it uses a streaming model internally (it can stream between cloud providers).

Being able to append to a file in 1 MByte chunks (or larger) would be perfect - that is exactly the way Amazon S3 multipart uploads and google drive multipart uploads work.

I'm planning on storing files as encrypted X megabyte chunks (where X is TBD) - would calculating per-chunk and then uploading solve it? There's metadata support which could store original filenames etc.

> We do plan to add file offset access and larger file support very soon, so you would be able to append a 1 MByte chunk to an existing file in Backblaze with a SHA-1 of only the 1 MByte chunk. That should allow you to stream?

Yeah, that would be sufficient.

Adjustable chunk sizes would be beneficial as well.