2- As a simple test try recreating the backup device.
3- If you have a cluster environment, and the backup only fails from the Pub but succeds on the Sub, you might be running into this bug CSCts22450 UC 8.5(1)-DRS backup of Subscriber is failing from Publisher node.
4- If the messages backup are over 1GB and you are using freeFTP you might be running into the following bug CSCsm21349 DRS Direct Backup stuck for freeFTPd server when tar size grow over 1GB.
There is also another bug CSCtf40892 DRS backups fail when backing up large components, but it should already be fixed for your version, in order to clarify we would need the DRF master and DRF local traces.
**As a workaround if you are not able to complete the backup for the messages with DRS and it is an urgent matter you may use the COBRAS tool : www.ciscounitytools.com\alldownloads.
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...