Windows VM timeouts during PVE-backup

Troubleshooting
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CMK version: raw-2.3.0p19
OS version: Ubuntu 22.04.4 LTS

Error message: n.a.

Output of “cmk --debug -vvn hostname”: n.a.

i have a couple of windows-vms running in a pve. i monitor them with checkmk-raw and the respective windows-agent.
every night the get backuped to pbs.
every night the check_mk service for a couple of these vms times-out, so i somehow assume this is a runtime issue.

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is there anything special i have to configure for this to “work” properly (pve, checkmk)?
i assumed this is a technical limitation, due to the freezing during the backup, so i already set Maximum number of check attempts for host for my windows vms to 3. this seem to cover about 85% of the “false-positives”. i probably can resolve it completely by upping this number more. is this a desired approach?

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