How many home users are backing up multiple terabytes of documents, though? I’d expect the vast majority of backed up data to be images and video in most cases.

Thanks. That is what it seemed like to me. $245 for the software and $5 for the storage per month. Which of course is a bit nuts.

Block level deduplication does seem interesting. My experience file level dedup is not that effective though of course incrementals are. Compression is not either but easy to do. Lot of document formats are already compressed too. Cross system dedup could be large savings also.