When creating a back up of a site using Central administration in Sharepoint, it used to create a couple of files, one being a .cmp.

Now it creates a folder filled with .bak files.

Am I doing something wrong, will this still work. Any help much appreciated!

  • sharepoint 2010 or 2013?
    – Aanchal
    Sep 30, 2014 at 12:17
  • Subsites and below = cmp. Sitecollections and above = bak. Sep 30, 2014 at 12:24
  • Sorry Sharepoint 2013!
    – abrosis
    Sep 30, 2014 at 12:39

1 Answer 1


When you are using site collection backup it will create ".BAK" by default and if you exporting a list or site it will create .cmp file.

.BAK: The BAK file type is primarily associated with 'Backup'.

.CMP is the Content Migration Package for Microsoft Sharepoint.When a Sharepoint website is backed up, a .CMP file is created. File usually contains; Library content, Security settings, User information, Navigation, ustomization and Personalizations.
This file is then generally used to Restore a Sharepoint website.

For more details check:



  • Thanks for your help! Basically I'm trying to create a back up so I can move a site collection to another server. Any chance you know what the best steps would be, I'll buy you a beer!
    – abrosis
    Sep 30, 2014 at 12:41
  • 1
    Thanks for your help, I've got it working now. I ended up using Sharepoint management shell, reluctantly and got it working. You made me realise I was probably doing it wrong, so thanks!
    – abrosis
    Sep 30, 2014 at 13:30

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