I have tested new feature cloud download. Seems it works for me as intended. No any issue with download/reset/installation. All personal data remained untouched (including OneDrive personal and working account folders). Also noted if you have programs installed just in C:\ (not C:\Program Files or C:\Program Files (x86)) those apps also remained not affected and completely working. So, cloud reset - it's in general cool, no-headache feature. Thanks MS team!