I guess the document has a slight issue about Configure Local Mode for Ops Manager Servers.

Please go to the following link:

https://docs.opsmanager.mongodb.com/current/tutorial/configure-local-mode/

And see the following part of this link:

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This enables Ops Manager can correctly read and extract the archived binaries.

sudo chmod -R 640 <path-to-the-versions-directory>/*
The resulting listing of the versions directory should look like this:

rw-r---- 1 mongodb-mms mongodb-mms 116513825 Apr 27 15:06 mongodb-linux-x86_64-2.6.9.tgz
rw-r---- 1 mongodb-mms mongodb-mms 51163601 May 22 10:05 mongodb-linux-x86_64-amazon-3.0.3.tgz
rw-r---- 1 mongodb-mms mongodb-mms 50972165 May 22 10:06 mongodb-linux-x86_64-suse11-3.0.3.tgz
rw-r---- 1 mongodb-mms mongodb-mms 95800685 Apr 27 15:05 mongodb-linux-x86_64-enterprise-amzn64-2.6.9.tgz
rw-r---- 1 mongodb-mms mongodb-mms 50594134 Apr 27 15:04 mongodb-linux-x86_64-enterprise-amzn64-3.0.2.tgz
rw-r---- 1 mongodb-mms mongodb-mms 50438645 Apr 27 15:04 mongodb-linux-x86_64-enterprise-suse11-3.0.2.tgz
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Because usually the archived binaries needed for backup daemon are extracted in the same directory with the archived binaries, if you do chmod -R 640 <path-to-the-versions-directory>/*, the extracted files such as mongod under the same directory lose executable permission, therefore the initial backup fails.

So it is recommended to give extra note about this in the document. Thanks.