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Failure Writing Backups to Azure Blob Storage Due to Limits Reached

David Fowler hits a wall:

Picture this, you’re happily backing up your database to a Azure blob storage until suddenly it starts mysteriously failing with the error…

Write to backup block blob device https://****** failed. Device has reached its limit of allowed blocks.

What’s going on, nothing’s changed?!

Read on to learn the cause of this issue as well as three ways to fix it.