When you update an Office 365 Plan, you can modify various settings, including the backup and content indexing.
Go to the Office 365 Plan
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From the navigation pane, go to Manage > Plans.
The Plans page appears.
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On the Office 365 tab, click on the plan.
The plan details page appears.
Modify the Backup Settings
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On the Overview tab, in the upper-right area of the SharePoint section, click Edit.
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In the Edit SharePoint settings window, specify the number of file versions to backup.
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Click Save.
Modify the Search Settings
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On the Overview tab, in the Search section, move the Content Indexing toggle key to the right.
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Click Edit.
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Under Advanced Options, in the Include file types section, include or exclude specific file types for content indexing.
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Click Save.