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Developer here.
Started this because I was looking for a cross platform backup GUI tool that let me create encrypted incremental snapshots to my NAS and B2 bucket on a schedule. The tools I found (both paid and free) were either clunky to use or didn't have a good engine (block-level deduplication, adjustable compression, encryption, speed, etc).
Here is a quick benchmark I did comparing BlobBackup to Duplicacy, Duplicati, Arq, and QBackup a few days ago. The benchmark doesn't cover all use cases (I'm going to try to do some to different storage destinations when I find time), but it's a decent measure of backup engine efficiency and speed.
https://blobbackup.com/10_gb_benchmark.php
I also put quite a bit of thought into the UI so it's much more usable (subjective I know but try the free version yourself) than the alternatives.