Backups are essential for other non-malware-related problems: file system corruption, hardware failure (bad RAM = scramble all your recently modified data), operator error, etc.
SD 1.2 worked fine on my Win10.
What do you suggest as far as cloud sync one? And why? From your insight?
Box has a limit on file sizes, so that's out.
Dropbox doesn't have a lot of (free) space either, so I don't know if it does versioning. I do use it for an "incoming" box, screenshot auto-upload, and some apps use it (YNAB, Titanium Backup), so I want that space available for those applications.
OneDrive only does versioning for Office files (Microsoft really needs to quit playing catch-up and commit to leadership already...it's really hard to take them seriously anymore and if it weren't for DirectX, I would have no use for Microsoft products.). cf.
https://onedrive.live.com/?invref=05360c2ca9778beb&invsrc=90
Google Drive does it. cf.
https://support.google.com/drive/answer/2409045?hl=en
I like Copy.com the best as I've used it for a couple of years, it's reliable, it works on LAN, and I've used versioning to recover files and the UI was intuitive. I keep all of "My Documents" on it. hehe try it and we both get more space:
https://copy.com?r=AUupvU
These all work on Windows and Android.