>Not sure if you know the answer to this Rob, but If I were to upgrade my account, do you think the restore feature will work? Here is a step by step as to what happens when I click on the "restore drive" :
Sorry, I don't know the answer to that. Most of my experience of OneDrive comes from the 1TB version one gets with Office 365 subscriptions. I do have a 5GB personal OneDrive that comes with my Microsoft account but I don't use that.
It uses the same OneDrive client but the colours are different - the blue icons are Office 265 OneDrives and the white one is my personal OneDrive: https://i.imgur.com/VTQclEI.png
With Office 365 OneDrive, you can get to this screen: https://i.imgur.com/ITbGZMK.png - so you can go back to a point in time. This feature was primarily introduced to combat future occurrences of a virus like Wanncry whereby your documents got encrypted. Once you got rid of the virus, this feature would restore your unencrypted documents. A nice feature but also useful for when you logon to an old computer and it restores long since deleted files. Easy to spot if you know you've done it as the timestamps are all very close. Becomes more difficult if you don't spot it immediately when you have added/edited files after that point in time as you can't just "undo" range of changes - you have to undo everything back to point in time.
I don't know if Dropbox or Google Drive have similar features as I've only got the free versions of those products. But as they don't suffer from this problem of logging onto an old computer (or restore a VM snapshot or drive image) and restoring long deleted files, I've never had reason to look.