[OS X TeX] Automatic backup TeXShop

[Bastian Philipps]

Greetings,

as described in TeXShops Help there seems to be a hidden pref, enabling 
TeXShop so make automatic backups on each LaTeX-Run.

I tried 'defaults write TeXShop SaveBackup YES' and after consulting the 
archives 'defaults write TeXShop KeepBackup YES', but somehow none works.

Could someone please point me to what I am doing wrong and by the way in 
what way those backups are made? Just a copy or even a simple versioning 
like text.tex >> text-1.tex >> text-2.tex ...

Thanks for the help

Greets
Bastian

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