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Storage space and the 4GB problem haven't been an issue for decades.
Yep, it's relatively easy to hook into file operations like that. The real issue I see with that proposal is speed. Copying a file every time you write to it will at the very least double the time it takes to save anything. On devices where the write speed might be less than 2MB/s, that's a significant addition. Editing the tags in an MP3 could go from less than a second to 10 seconds per edit for example, during which time the application will be frozen because it's waiting on the write process to complete.
It would be a nice feature to have as an option I guess for people who are ok with it. A more traditional backup tool included with the OS might be nicer - I've used BackUp for that purpose for many years.
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