Apple File System
&gt; Flash &#x2F; SSD Optimization<p>I.e., a &quot;unique copy-on-write design&quot;<p>&gt; Space Sharing<p>Basically, ZFS datasets.<p>&gt; Snapshots<p>If those can be sent: Finally Time Machine done right.<p>&gt; The AFP protocol is deprecated and cannot be used to share APFS formatted volumes.<p>Interesting.<p>&gt; An open source implementation is not available at this time. Apple plans to document and publish the APFS volume format when Apple File System is released in 2017.<p>Yay!<p>Limitations: <a href="https:&#x2F;&#x2F;developer.apple.com&#x2F;library&#x2F;prerelease&#x2F;content&#x2F;documentation&#x2F;FileManagement&#x2F;Conceptual&#x2F;APFS_Guide&#x2F;UsingtheAppleFileSystem&#x2F;UsingtheAppleFileSystem.html#&#x2F;&#x2F;apple_ref&#x2F;doc&#x2F;uid&#x2F;TP40016999-CH4-DontLinkElementID_24" rel="nofollow">https:&#x2F;&#x2F;developer.apple.com&#x2F;library&#x2F;prerelease&#x2F;content&#x2F;docum...</a><p>Edit:<p>&gt; encryption models for each volume in a container: no encryption, single-key encryption, or multi-key encryption with per-file keys for file data and a separate key for sensitive metadata<p>Nice. I hope they also include checksums for each block.<p>Famously missing, but not the hardest thing to add considering all the features above: Compression (which HFS+ supports!)