Percona Backup for MongoDB vs fake2db: What are the differences?

Developers describe Percona Backup for MongoDB as "A fully supported, open source, community backup tool for performing consistent hot backups in MongoDB". It is a distributed, low-impact solution for achieving consistent backups of MongoDB sharded clusters and replica sets. It supports Percona Server for MongoDB and MongoDB Community v3.6 or higher with MongoDB Replication enabled. It is an alternative for users who want a fully supported community backup tool, but do not want to pay for MongoDB Enterprise and Ops Manager. With easy command-line interface, you can perform consistent backup/restore of clusters and non-sharded replica sets, and improve cluster backup consistency. This saves you time and effort if you are implementing MongoDB backups for the first time. On the other hand, fake2db is detailed as "Create test databases that are populated with fake data". Generate fake but valid data filled databases for test purposes using most popular patterns(AFAIK). Current support is sqlite, mysql, postgresql, mongodb.

Percona Backup for MongoDB and fake2db can be primarily classified as "Database" tools.

fake2db is an open source tool with 2.03K GitHub stars and 115 GitHub forks. Here's a link to fake2db's open source repository on GitHub.