Just make sure he keeps backups from now on especially with something like upgrading an OS, whether you're installing a new Windows or install a new Linux OS, always backup beforehand.
Windows 10 allows you to do full image backups set on a schedule, file history backup where it backups your personal files every 1 hour and allows you to restore from those hourly backups, and you can also sync to Microsoft Onedrive which comes installed by default. Basically there's already a good amount of backup options that come with Windows 10 and you can also download a free tool like Backupper.
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