One thing to bear in mind that the issue with running a seedbox at home is that most people don't have symmetric upload/download speeds, so you will be out-seeded by those who rent dedicated seedboxes. Still a great home project though.
That's a clozed-source knockoff of Anki. With SRS it's important that you choose a solution that will still be working in 5, 10, or even 20 years. Anki being open-source and sporting an open format fits that bill. Also, it has a proper desktop app, so you never need to worry about losing access to your data ahead of an important exam, etc.