On Windows, the
ProgramData folder is used to store program specific information that is not specific to any user.
AppData is for the user specific specific users. A typical example of what often goes into these folders are configuration settings.
So one might be inclined to include both folders in your backup. The problem is: there is also a lot (!) of useless junk in there that you definitely don’t want to backup. (At least not if you’re paying for the storage space.) To name but one example: Chrome saves the temporary browsing data there, which easily adds up to hundreds of megabytes with lots of files changing every time you open a web page. (And that means, it will use lots of storage if backed up.)
So I have currently excluded both folders from my backup. But: that is not ideal either, because, as I said, there may well be some valuable data there. The problem is: finding the relevant sub- and sub-sub-folders it’s a bit like digging gold. Which brings me to the point of this topic: let’s share what we know!
If you are aware of any valuable data in either the
ProgramData or the
AppData folders, please post a quick reply here, stating the path and (unless it’s self evident) which program it belongs to and what it is used for / why you have included it in your backup.