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Same Situation on our site. Since moving from DPM on Server 2012 to DPM 2019 on Server 2016/ 2019 we are forced to use ReFs and modern Backup Storage. Generally a good idea if this would work. But after some weeks backups are getting extreemely slow and unreliable. A ticket with our premier support returned to buy a new storage with SSD discs. A very ridiculous "solution" to my opinion.
I now installed DPM 2019 on Windows Server 2012R2 using the same SAN storage "that ist too slow for ReFS". Now i am able to use Dynamic NTFS volumes again, and the backups are stable. MICROSOFT FIX THIS ERROR.