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#11
Personally, I keep data on a separate drive, so it keeps OS image lean and mean, and backup valuable data to onedrive. I do not bother backing up my videos partition regularly (80% of my data) as that is non critical to me. I do back it up every three months or so to an external drive. I can always redownload stuff pretty quickly anyway.
By keeping data from OS, it speeds image backup by order of magnitude, plus if the restore did fail, I can do a clean install without losing data.