ZFS snapshots based on CoW are superiour to VSS previous states as they work only on a good will base on open files while ZFS snapshots represent simply the last state of the fiesystem prior a datablock write.

Luckily OpenZFS on Windows is near (currently release candidate 11) with some remaining bugs around volume mount. If you avoid encrypted volumes not a serious problem, good enough for evaluation. Development is fast with a new release candidate every few weeks to adress remaining problems.

The sister project OpenZFS on OSX has already reached release state last week.