What does it actually mean to say the website is stateless?

I am having trouble resolving an important query!
I understand that Azure websites are stateless in the sense of session state for a web application.
However, what I am getting contradictory messages about is as to whether if a website VM is reset, you would lose any changes to a website (i.e. it would revert to the original version).
This would seem rather peculiar, I would understand reversion to the last deployed version before a problem.
So the questions are:
1. To what point in time is a website restored to if a VM fails (assuming we just have a single instance ?)
2. If the VM does get reset, do you lose the contents of the data, LogFiles and any custom directories in the site folders and underneath the wwwroot directory you see when logging in with FTP?
I have just thought of a related question if you had multiple instances, would these custom directories and their contents replicate between instances? (i.e. would they sync to the latest version?)
The background is that the current site that is being moved from an ISP, will upload user files for temporary storage until the customer downloads them. Obviously a long term aim is to get these into BLOB storage.
mmacneill123 (MCP)

Thanks David
I am 99% certain that answers by question, I do not see a D:\home but I assume the website is on d by default and the home directory just \ in an FTP client?
Thanks :-)
mmacneill123 (MCP)

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But I am getting this alert from SCOM and SCOM has no information about the alert for me to find out what to do - thought that was the point of SCOM to let you know of problems and how to resolve them. :)
The alert is coming from the Error Count Monitor that is part of the Hyper-V Management Pack Extensions (v 4.0.0.0)
I have tried looking in the Event Logs on the Host and there doesn't seem to be any storage related errors there. I am trying to establish if this is a false positive, why it is happening and if it is safe to override and ignore.
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