Apple admits Autosave/Versions bug in Lion

Just wanted to get the word out on a critical flaw with the current implementation of autosave and versions in Lion. While autosave is supposed to create a backup version before it saves your document, there are certain file systems that do not support it. Because of this, Lion is supposed to alert the user that changes will be overwritten and versioning is not supported on non-journaled file systems. Unfortunately there is a bug in this which can be replicated using the steps below.
1. Format an external USB flash drive as FAT32.
2. Create a text document or photo on this volume.
3. Open the document and make a change (textedit or preview).
4. Close the document. Note the document is auto saved and no warning is provided.
5. Open the document and note that your changes were auto saved for you.
6. Attempts to recover a previous version are will fail as FAT32 does not support versions.
I have reported this to Apple and received the following response acknowledging the bug:
"I did hear from Engineering today.  They said they were able to reproduce the issue and will report it so that the OS may be improved in the future.  Unfortunately there is not a way to turn off AutoSave.   Not that this would help for the accidental closing after making changes, but they said that one would need to chose Revert to Save prior to closing the window in order to not save the changes.  Thank you for reporting this and I hope we can fix that soon, and I apologize that there is not a workaround at this time."
Hopefully the word gets out on this! I am testing other scenarios, at this point I do not fully trust that auto saved documents will be recoverable via versions as other bugs could exist.

Emde, it's quite refreshing to see a quote like that published on an open forum.  Keep up the good work!
You're lucky that you're not a developer.  When Apple admits stuff like that to developers, we can't tell anyone about it because we're bound by a non-disclosure clause.

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