Each of the concepts below links to more background.
Click them to learn more, or keep reading.
Bazil is a file system, a special folder on all of your computers where the same contents are available on every machine – we'll call each one a peer – at least after they've had a chance to transfer the data.
Bazil keeps your data private, using convergent encryption that lets you decide who is able to use your files – sharing with friends when you want to.
Your files are stored where you want to store them. Bazil is not tied to a proprietary cloud storage provider. You can store your files fully on local hard drives, or your own private server, if you wish.
All of the files you store in a Bazil volume are deduplicated – copies of the same file contents take up no extra space – and a snapshot can be stored as a backup, letting you browse old versions of all the files.
Bazil is not just a file synchronizer. Each computer stores only what it has disk space for, and the rest of the data is fetched over the network as needed – preferring the nearby, faster sources – and cached locally. This means a laptop with limited disk space can still access all your files. You can pin files for offline use, for example airplane travel. This also helps when you are weakly connected – that is, your internet connectivity is slower than usual, for example when tethering to a cell phone, or at a hotel.
Changes made while offline or just weakly connected are synchronized between all peers. There is no central location, and no cloud service that you would need to pay for, if you don't want to use one.
If two different offline peers make changes to the same file at or nearly the same time, you may get conflicts. This means you will have both versions of the file available, and you need to decide what to do. This is just like it is with more traditional file synchronizers, and is fairly rare in practice.
Bazil is free software, open source and free to use. It builds on a large pool of previous work.
Bazil is still in development, and not ready for every day users.