Not about Windows in general, but about another Microsoft product, One Drive.
For a time, I insisted on the self-contained, non-subscription MS Office package. But Microsoft won me over to the subscription standard by coupling it with 1 TB of online storage, all for a very reasonable price $70 per year. On the whole, I do like One Drive, but I recently discovered that it can screw you up if you let it.
The system tends to push the option of syncing one's files with One Drive. It's not an all or nothing feature as you can select what you want to sync and what not. I went with different degrees of sync at different times, but something always bothered me. I never seemed to save as much hard drive space as I thought I should. Well, recently, I learned the "secret" behind both syncing and the seemingly intuitive One Drive Folder.
One Drive comes with a folder you where you can keep what you will be using most often. [Confession: To this day, I've never read any One Drive documentation as that's not something I normally do with software.] I naturally - or foolishly - expected that the One Drive folder was online, literally out there in the One Drive virtual storage depot. Well, it's not. It's right there on your computer. That's why I wasn't saving as much space as I thought I could.
In itself, that is no big deal. A little disappointing, but not a terrible thing. What is terrifying,however, is syncing. This function has One Drive do realtime updates to whatever folder you choose to keep synced. One bad thing about this is that your own computer then becomes second in line relative to the folders in question. That is, One Drive saves everything first to itself in virtual land, and then copies to your computer. I tried to neutralize this irritation by designating key folders as "Always Keep on this Computer". This detail is helpful in that I always have instant access to any already created file in those folders. But it doesn't nullify the One Drive first, you second problematic, which, under certain circumstances can prove "deadly".
A couple of days ago I uploaded (downloaded?) just under 2 gigs of data, seemingly to my computer, with the thought that I would transfer it afterwards to One Drive as well as to a micro storage card. I couldn't save it directly to the card because the source of the data was a different swapped out card, and there's only one slot of that type. Well, after I finished transferring the data I discovered much to my dismay that I could no longer access the internet!
What happened is that One Drive immediately started grabbing the data, and hogged 100% of my bandwidth! No way to pause. No way to stop the transfer. I was pissed.
A couple of peculiarities of One Drive should be mentioned here.
1. If you rename a folder in the One Drive folder, it immediately deletes everything that was in it! - Absolutely counter to the way normal folders work. It's super inconvenient.
2. It just can't handle folders with more than one level of embedded folders. I mean. it cannot transfer complex folders, but lacks the transparency to warn the user. [Yeah, maybe that's in the documentation.]
Well, I waited around 8-10 HOURS for it to complete the transfer. But it never did. Frustrated, I tried quitting One Drive, restarting the computer, even uninstalling One Drive. But still no response, and no internet. Then it got "good". I went to my other laptop to use it to resolve the problem. However, since it is also connected to One Drive, it couldn't connect either. AND NEITHER COULD MY APPLE DEVICES OR MY SMARTPHONE! I tried a partial reset of the secondary laptop, but to no avail. Then, out of desperation, I reverted the laptop to to it's original state! But still no internet.
It's now just sitting there. Blank! Eventually I'll want to do something with it.
Gotta give it to them, Microsoft got me good! Anyway, after endless manipulations and trial and errors assisted by intermittent internet connectivity, I was able to figure out how to solve the problem, and also, I believe, prevent it from happening again. I now have a grand total of two folders in my One Drive folder, and they are the only folders that sync. I'm now alerted to the potential hazards of uploading complex folders, and nothing else on my hard drive syncs at all. If I want something backed up, I'll do it manually.
The amusing postscript is that my hard drive space utilization is virtually the same as it always was. All syncing does is provide immediate backups, a very meager benefit. It doesn't save an iota of space on your computer.