...using Outlook as a client in (the now common) IMAP mode will deliver an offline copy in a .OST file deep in the User's Appdata folder structures. It is possible, but not simple, to back these up and re-import them, albeit into another account, if the originals go missing.
The alternative is to access the Virgin media mail via POP/SMTP (ensuring you set the "leave a copy on the server" such that webmail etc. continues working as expected). This will create a .PST file for which you can define a location. This makes it relatively easy to retain a copy at intervals, and that can be re-imported relatively easily.
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