I know that restic is another great alternative, many preferences for this or that software are determined by how much you are used to work with it.
Not sure what’s wrong with python, or cython; about encryption, borg actually encrypts per default (you have to opt-out explicitly with borg init --encryption=none); borg also conveniently compresses (using zstd too) & dedups very, very efficiently. Comparisons between the two have been considered in various places, even on the restic forum itself where some possible advantages of borg are analysed. Some borg functionalities have been discussed in previous threads here as well
Both are good and preference is eventually pretty personal. About “OOB” readiness: wrappers are available for borg but hey this is hostballs hostedtalk after all 
so I suppose some people hanging around here isn’t reluctant to get their hands… dirty
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