No zealtory. I'd rather have the interpreter installed from the distribution and drop the fatpacked program with bundled libraries and everything in a bin directory. If it needs installing on Windows then the fatcpacked binary with bundled interpreter is also fine.
Also why would deduplicating be uninteresting when the backups are SQL dumps? That is EXACTLY the scenario in which deduplication would shine, because it would take each dump and find parts of it that are the same as the latest backup, finding the individual small chunks that have changed in those dumps, and only backing them up. Do you actually know how deduplication works? You might want to look that up more properly.