Quote:
Originally Posted by fitzhugh
Even a popup window saying something like the following would be fine:
"Converting a file to the same format (e.g., EPUB to EPUB) will overwrite the original file. Would you like to continue?
[] yes [x]no
Note: Make a duplicate copy before running the conversion if you wish to preserve the original version."!
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Good Idea.
Kovid did you one better in the current release.
Release: 0.8.11 [22 Jul, 2011]
New Features When doing a conversion from some format to the same format, save the original file
When calibre does a conversion from the same format to the same format, for example, from EPUB to EPUB, the original file is saved as original_epub, so that in case the conversion is poor, you can change the settings and run it again. The original is automatically used every time you run a conversion with that format as input. If you want to disable this, there is a tweak that prevents calibre from saving the originals in Preferences->Tweaks. You can easily replace the converted version with the original in the Edit metadata dialog by right clicking on the list of formats in the top right corner.