Hello!To be honest, some kind of strange approach to the concept of auto-save😁The essence of auto-backup is that 3ds Max in the background, with a certain period, makes a temporary copy of the scene in case something goes wrong and 3ds Max crashes with an error. Not only that, in the background, it still does a limited number of backups (by default 3) and constantly re-uses them after this number of times is saved.Of course, the automatic saving function is configured to save temporary backups to one folder. By default, this is c: UsersAdministratorDocuments3dsMaxautoback ... There's no point in changing its location, moving it from documents to the project folder.Judging by your description, you do not need auto-backup, but simply the story of working with the scene. That is, you made a key step - made a copy of the scene, namodelil something else important - made a copy of the scene. To do this, 3ds Max has a special function: Save the current 3ds max file under an incremental name. It is located in the FileSave AsSave Copy As menu.The essence of this function is that by saving the scene with the Save Copy As command, instead of the usual Save or Save As, 3ds Max saves it with the current name, but assigning it a numeric index. For example, if you save as a copy, the scena.max scene, it will be saved as scena01.max to the same folder as the original scene. The main charm of this function is that if you save it as a copy again, the max will automatically offer the name scena02.max and so many copies.I always keep in the project folder, along with the original scene, 10-20 copies of it, made using Save Copy As. It is very convenient. First, copies do not with a period in time, but when necessary, at key moments. Secondly, there is no need to suffer with all sorts of ways, all copies are in the project folder. Thirdly, regardless of the background, the same 3ds Max Auto Backup works, in case the program crashes until the main scene or step (copy stage) is saved.
Thank you 🙂