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There are lots of blogger user who want to make backup of their articles, just to protect their work or to move their blog to another blogging service or simply to store their blog on your own hard drive. If you are one of them then you need to follow the given instructions below:

The downloaded file will be in XML format and you can rename it for convenience. Now, your posts are safe on your hard drive and if somehow you lost your posts, you can easily recover them by Import blog link in Settings > Basic > Import.

http://www.rajeshpatel.net/how-to-backup-blogger-articles/