Inactive copy of Outlook OST will not back up

3+GB Outlook .OST file will not back up (error: “these files failed to back up”). To confirm this file was not just blocked because it was in use - made a second copy of that OST file and the inactive copy will also not back up. The external drive is formatted NTFS and connected via USB. Latest version WDBackup installed. Windows 10. Thoughts?

Hi there,

Please know, WD Backup will not backup files that are locked or in use by the Windows operating system, running software, programs or processes.

If in any case you Outlook .ost file is note working or OST file got inactive then the only solution left is restoring that OST file.

There a lot of tips available on internet regarding restoring OST file you can follow them and make you OST file accessible again. But if you want an automated solution then you can go with Softaken OST Repair app. This application works up to the mark and provide a decent solution by recovering the damaged or inactive OST file. You can download it for free from its official website.