For fun? To prove that it is possible? As a learning activity? There are millions of reasons to write software other than "faster" or "more features". I can i

For fun? To prove that it is possible? As a learning activity? There are millions of reasons to write software other than "faster" or "more features". I can imagine this being convenient (albeit risky) when migrating Windows to Linux if you really can't afford a spare disk to backup all your data.