FWIW:
Note that the "dump" program (the original program used to backup *nix file systems to tape) uses ctime for determining whether the file has changed when doing incremental backups. Not surprising, since the inode information is equally important to the restoration of a file to it's backed-up state.
Also note that (on UFS) mtime and atime are able to be changed by the user quite easily [see utime(2)] to any value the user desires, but ctime is more secure, and is only changed indirectly by various system calls.
rgr
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