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This is an article from Technet Magazine : https://technet.microsoft.com/en-us/magazine/2009.07.sqlbackup.aspx
![dd822915.fig03_L(en-us)[1]](https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/patricg/WindowsLiveWriter/UnderstandingSQLServerBackups_C981/dd822915.fig03_L(en-us)%5B1%5D_thumb.gif "dd822915.fig03_L(en-us)[1]")
![dd822915.fig04_L(en-us)[1]](https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/patricg/WindowsLiveWriter/UnderstandingSQLServerBackups_C981/dd822915.fig04_L(en-us)%5B1%5D_thumb.gif "dd822915.fig04_L(en-us)[1]")
![dd822915.fig03_L(en-us)[1]](https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/patricg/WindowsLiveWriter/UnderstandingSQLServerBackups_C981/dd822915.fig03_L(en-us)%5B1%5D_2.gif "dd822915.fig03_L(en-us)[1]")
![dd822915.fig04_L(en-us)[1]](https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/patricg/WindowsLiveWriter/UnderstandingSQLServerBackups_C981/dd822915.fig04_L(en-us)%5B1%5D_2.gif "dd822915.fig04_L(en-us)[1]")