Adding All Sites to Office 365 Retention Preservation Policy

We are trying to add all "sites" to a preservation policy in Office 365 Retention.  I found this ( regarding how to accomplish it for the mailboxes, and would like to apply the same logic to the site retention if possible.
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Vasil Michev (MVP)Commented:
PowerShell is the answer, but even with it the task can be messy. Basically you need to enumerate all sites and get the URLs, then feed them to the New/Set-RetentionCompliancePolicy cmdlet. I've written a detailed post on this here:

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slattdogAuthor Commented:
Thanks Vasil!  (Great article btw :)
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