You can define a list of objects names to exclude from a backup operation. You can use standard regular expressions to match a set of objects. For example, if you want to skip all external objects, enter .*__x$.
You should exclude all external objects, as they are not supported. Backup operations that include external objects are expected to fail.
Procedure
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From the navigation pane, go to Protect > Salesforce.
The Salesforce Overview page appears.
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Go to the Organizations tab.
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In the Name column, click the app.
The app details page appears.
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On the Overview tab, in the Content tile, click the Edit button
.The Content dialog box appears.
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In the Exclude objects section, in the Object name box, type the object name, and then click Add.
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Click Save.