A backup copy is a single .QBB file containing your whole company file. This is what to send us when we ask for your QuickBooks Desktop data.
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In QuickBooks Desktop, open the File menu and choose Back Up Company, then Create Local Backup

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Select Local backup and click Next

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Choose where to save the file and confirm the backup options, then click OK

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Choose Save it now and click Next to create the file

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QuickBooks confirms when the backup is complete. Upload the
.QBBfile through the client portal (Opens in a new tab)
Send backup files through the client portal, not email. The file contains your full accounting records.