Subversion is one of a class of programs that has been used by programmers for decades: the source code control system, which developers use to manage changes to program source code. Such software has features that enable large teams to work in a distributed environment on the same files while keeping track of who has done what, and when. But even if you work by yourself on spreadsheets and word processing documents, you can harness the power of Subversion to eliminate the need to litter your directories with files like "forcast.xlsOLD" and "Presentation.docFirstDraft."
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