The Internet is teeming with services you can take advantage of. You can store your files in the cloud, share movies, organize photo collections, talk with friends, manage your projects and so on. It also means that your data is stored outside your computer and you don’t have full control over it.
You may use self-hosted counterparts of services. Instead of accepting vague privacy policies, you may set the rules. However, you are fully responsible for sustaining your data.
I used to consider self-hosted services as a privacy-respective and cheap alternatives of popular services. The former is true, however, the latter factor is often far-fetched.