We do not recommend backing up database files or similar files such as Outlook files that are in-use by applications because there is no way for NAS/Linux devices to execute Shadow Copy which is only available on machines running Windows.
See: https://en.wikipedia.org/wiki/Shadow_Copy
What we recommend is to create a backup on device, for example, a Database Backup Job which will generate a separate file which you can then back up to the cloud.
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