I'm not at sure how I came about this/which box was ticked in saving options but whenever I save eps files, Illustrator will also save another backup file with '-01' after the filename and before the extension '.eps'. Also, whenever I save the document (as opposed to 'save as') a dialogue box will appear asking me if I want to replace the already existing file. Obviously I do.
My question is: How do I turn this option off?
NOTE: as far as I know, this problem of mine is only limited to .eps files, or more precisely it doesn't seem to happen when saving .ai files.
When saving EPS files be sure to unckeck the box, lower left in the save dialog that says Use Artboards.
I can't see the relevance in "Use Artboards" and saving a back up but I'll take it.