New to Duplicacy

Hi,

I am new to Duplicacy; I am trying it and like it very much.
Kudos to the developers.
Before Duplicacy, I used restic, which I consider a powerful resource.
I have three questions:

  1. Why the backup of the same folders with Duplicacy is 65GB and with restic 45GB?
  2. I am using the web GUI. Is there any way to use the CLI simultaneously (I saw that it needs init as the first command, but I cannot run init on buckets already initialized)?
  3. What S3 provider do you suggest me (I am working with Blackblaze)?

All the best