imho, you should use version control (git, subversion, mercurial, etc) to 
take control for your code . and for change a running system, imho, u 
should upgrade to the latest version (for bug fixing purpose, security 
hole, etc), but test it carefully first before you upgrade your system (in 
testing environment). for tutorial, what kind of version control do you 
want to use? every version control have it's own way. e.g. git versioning 
way is different with subversion or mercurial, please refer to the manual 
on their website and documentation.

best regards,
stifan

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