If there’s data you need to recover from a backup, now is the time to do so. Start with File History – go to Settings > ‘Update & security’ > Backup and click ‘More options’ followed by ‘See advanced settings’ to switch to the File History control panel. Click ‘Select Drive’ to see available drives, then select your existing backup drive and you’ll either see a box marked ‘I want to use a previous back-up on this File History drive’ (tick it if so) or a list of previous backups from the system (select the most recent one to continue using it). Once selected, you’ll be able to recover data from the backup in the usual way: type ‘file history’ into the Search box and click ‘Restore your files with File History’ to get started.
If you’re looking for a file from your previous Windows installation – perhaps because it’s not in File History or you forgot something from an obscure user folder – then the Macrium Reflect disk image you took prior to reinstalling will ride to your rescue.
Make sure Macrium is reinstalled, then browse for the image. Double-click it to open a Backup Selection window. Tick the drive you want access to, then tick ‘Enable access to restricted folders’, assign it a drive letter and click OK. You can now browse this image via File Explorer like any other drive – now simply copy any files that you need from the drive to their new location to restore them.