If I update the files
- How much time it will take to upgrade?
- Which files I need to backup?
- Is it any manual way to upgrade or just clicking on upgrade and it will do automatic?
I am new in Magento. Early response is appreciated...
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1) It is depends on internet and server connection.
2) For safety purposes you need to take backups of the entire database and file & directory structure apart from the /var folder.
3) Magento provides instructions for upgrade of the magento.com web site.
also check this link :) Upgrade 126.96.36.199 to 1.9.3 advice