bupstash.io was my favored option other than ZFS. It's a beautiful and performant solution. Being filesystem agnostic is an advantage in many contexts. In the

bupstash.io was my favored option other than ZFS. It's a beautiful and performant solution. Being filesystem agnostic is an advantage in many contexts. In the end I chose ZFS for the efficiency of snapshots (vs. a full disk scan) and atomicity. Both enable more frequent, smaller syncs, which is perfect for a laptop.