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indeed , good reminder, I already had the dcomcnfg.exe tip written down but was forgotten because it's only cosmetic. (https://help.remote-backup.com/index.php?/Knowledgebase/Article/View/327/5/eliminating-vss-error-8194-from-event-log ) Another tip, for MS SQL , is VssOption setting available...

Can you tell us more why ?

where is the most important, wg confs ?!

it's not recommended to backup to PBS over WAN if guest is running. Guest is slowdown during live backup up to crash guest if connection break or too slow, there is a new fleecing option to mitigate but fails can occur. the more robust and the recommended way is PBS local to PVE. (PBS can even...

Wrong wording, ANY hypervisor shouldn't be exposed to the public, this is not specific to PVE.

both have the "Flash Backed Write Cache"? with same size ? same write ratio ?

try with E-Cores disabled from bios.

yes

search in app log and Windows Event Log.

don't forget Select scsi virtio single as controller, which is the faster. edit : missing tests was only baremetal.

updating Windows driver is done from device manager, right click on scsi disk controller, "update driver", then Select driver .inf

no, some precious data can be easy lost if there is system crash too. unsafe (even regular writecache) is only recommended for temporary VM, do not use writecache with 24/7 VM. I already had corruption, Windows boot but error loading some apps or DB corrupt, with Lvmthin on Datacenter SSD.

you can prevent using mount point, while unmounted, with : chattr +i /mnt/backup

without proxmox and guests configs (in CODE tags please) , nobody can guess there isn't magic.

so there is throttle between your host and your external PBS, it's out of scope of Proxmox.

currently you need to keep your "post-up" iptables PREROUTING rule , as port forwarding need to done manually. Would be great if PREROUTING rules can be managed by PVE Firewall directly.

No it's not possible. Cluster is for high availability. Virtual machine will run on one physical machine at a time.

Try disabling the writecache , each disk, each VM.

please put results into CODE tags. it's already hard to understand your problem. I mean guest to your external PBS !

what about iperf3 within guests ?