The upstream source for Percona Xtrabackup matches the layout of MySQL,
including files from the project that are essential to building the Percona
binaries. The source code related to Xtrabackup specifically is located in
storage/innobase/xtrabackup.

While the version number of percona-xtrabackup may be less than that of
mysql-8.0, it is garunteed by upstream to work with any equivalent or
greater MySQL 8.0 system.

This repository also contains a copy of rapidjson. However all JSON-licensed
sections of the library are not included so that it remains free software.
See extra/rapidjson/license_readme-oracle.txt for more information.
