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I'm using QB Premier 2019 and whenever I try to create a local backup, the process fails at validating data. Tried rebuilding, re-installing QB but nothing worked!
How big is you file size? Install the trial license of Pro 2020 and try creating a backup file.
https://quickbooks.intuit.com/learn-support/en-us/new-subscriptions/download-a-trial-of-quickbooks-d...