Nope. That would be Documents.
AppData is meant for caching and temporary data, but not for stuff people would consider their "saved data". And even if you use AppData, you'd have to store it in "Local" not in "Roaming", especially if you have big amounts of data. Roaming is meant for so called "roaming profiles", which are hardly every used in a private environment.
You'll find Skyrim's "plugins.txt" in AppData\Local, while Skyrim's user settings and saved games are in Documents\My Games. And that's for a reason.
WIndow's default backup is saving, Documents, for example, but not AppData.
Nope, sorry, but you misunderstand how AppData and Documents are supposed to be used, but don't worry, you're not the only one, by far.
AppData is the correct location for all application specific data, documents is the place for all user-maintained data.
Documents is for when you, the user, manage file and intend to share it across applications, i.e. a text document you edit inside fffice and then send per email. Files that you open in an application through a "open file" dialog, do whatever with it and when you close it the application forgets about the file.
Mods in Vortex are not that, Vortex manages the entire lifecycle of a mod. It downloads it, extracts it, has a database with metadata about a mod, ....
Vortex (and other mod managers) try to pick up on any changes you do to the mods as best as possible but that doesn't change the fact that conceptually Vortex is responsible for managing the mods. You install mods through vortex, you should remove them through it. And that makes them application data, not user documents.
We could argue about whether local or roaming is the correct location. local is intended for application data that is specific to this user account on this system. This is mostly caches. Roaming is intended for application data that is specific to a user, but not to the machine. If roaming profiles are not used on a system it doesn't matter at all in practice anyway but if it is it really depends on the user whether they want their mods and vortex settings/meta data/... to travel with them, but conceptually I don't see why your mod configuration would be system specific in general.
Finally, your argument about Skyrim placing user settings and saved games in documents: Let me just quote wikipedia https://en.wikipedia...ki/My_Documents here:
This folder is supposed to be a personal area where users store their personal non-shared documents. However, many software developers have ignored this convention and as a result, this folder has become a dumping ground for the application data such as files containing settings and saved games. Users cannot delete, move or organize these files without causing unwanted behavior in their software.
Until Windows XP, it contained other subfolders such as "My Pictures", "My Music" and "My Videos". Starting with Windows Vista, these subfolders were moved out of My Documents and were made its siblings.
Odd, how "My Games" is the only default documents directory that still resides below documents, right?
Why? Because "My Games" was never a standard directory to begin with, there is no api in windows for "get me the my games folder on this system" and hence all games coded it as "<path to my documents>\my games" and thus now it can't be moved or renamed, it's also the only of these folders that is not localized for different languages.
This is simply shoddy planning and development on Microsofts part, not something you want to use as an example...
Plain simply game settings and savegames are not user documents and should not be in Documents but it has developed into a de-facto standard because a lot of game developers were also confused about documents vs appdata.