Thanks for your explanation.

What does the license change actually mean? What are the differences?

As far as I know, by definition, at least restic is not incremental. It is a mix of full backup and incremental backup.

Thanks for your hint towards borgbackup.

After reading the Quick Start of Borg Backup they look very similar. But as far as I can tell, borg can be encrypted and compressed while restic is always. You can mounting your backups in restic to. It also seems that restic supports more repository locations such as several cloud storages and via a special http server.

I also noticed that borg is mainly written in python while restic is written in go. That said I assume that restic is a bit faster based on the language (I have not tested that).