The backup suffix is '~'. That is, a single tilde character is appended
to the given file name.
[/help]
+ [option preserve]
+ summary = preserve modification time
+ [help]
+ If this option is given, the mtime of the modified file is set to
+ the value prior to the modification.
+ [/help]
[option year]
short_opt = y
summary = set the year tag