With respect to One Drive the syncing with your PC or other device can indeed be dangerous as it endeavours to keep your documents etc on the device the same. However this can be adjusted in settings to stop that.
I've just had a two day stint with a new beta build 16288.1 of Windows 10. Several attempts to install it online failed and I was getting close to giving up when I noticed some services had somehow been set to manual rather than automatic. No information was given on the failures other than an obscure error code which I Googled for hours before getting a clue.
Some sites are putting it down to malware but repeated scans with Malwarebytes and Hitman Pro and Defender found nothing.
Last night I reset the
services start up to where I think it should be and left it overnight to try again. Happily got up this morning to find the build had gone in. I'll be keeping an eye on those services in future.