Junhao, Why does option 2 cause a loss of institutional knowledge? Is file ownership being used to track authorship? Or is there a concern that people will delete or overwrite data? Maybe a content management solution would meet your requirements more effectively? I supported an R&D environment once in which engineers used Unix file ownership and modification timestamps for code versioning. It didn't work very well. I tried to get them to use CVS, but they didn't care for it.
-Pam
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