How to backup emails in Microsoft Outlook

I am running Microsoft Outlook 2010.  I have over 40,000 emails in my inbox.  How do I back them up as I would like to delete these messages from my hard drive.  The purpose is to clean up the hard drive before I clone it to an SSD drive.
Richard ChristensenRetired computer technicianAsked:
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create PST files.
Benjamin VoglarIT ProCommented:
Just copy PST files.

1.In Outlook 2010, click the File tab.

2.Click Account Settings, and then click Account Settings.

3.On the Data tab, click an entry, and then click Open Folder Location.

4. Copy  PSTs on USB DISK
Create an Outlook Data File (.pst)

On the Home tab, in the New group, click New Items, point to More Items, and then clickOutlook Data File.

In the Create or Open Outlook Data Filedialog box, in the File name box, type the name as you want it to appear in the Outlook Navigation Pane, and then click OK.

By default, data files are not password-protected. To add a password to your data file, under Password, type that password that you want to use in the Password and Verify Password text boxes.

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File>Import and Export>Export to a file> Personal Folder File(PST). Select where you want it saved. Once complete, copy to flash drive. Then you can go back into Outlook and delete the emails you do not need. If you need to recover email from the pst, connect the flash drive with the pst file, Then File>Open>Outlook Data File> select the pst > click open. This will open the pst under your mailbox as a separate folder where you can open your backed up emails.
Richard ChristensenRetired computer technicianAuthor Commented:
These answers are all very helpful.  
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