Hey teffyjean! Welcome to the community – I wish it were under better circumstances! I can definitely help you out, though.
If you don’t have a backup of that folder, you’ll need to uninstall VirtualBox & Local, and restore your sites from their folders on your system.
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Step one – here is a doc outlining how to uninstall VirtualBox & Local
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Step two – reinstall Local
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Step three – here is a doc on restoring your sites from their Local folders
Let us know if this solves your issue!