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Perhaps do you have an old version of PVE? Have you tried to apt update apt full-upgrade ?

From man qm qm importdisk <vmid> <source> <storage> [OPTIONS] Import an external disk image as an unused disk in a VM. The image format has to be supported by qemu-img(1). <vmid>: <integer> (1 - N) The (unique) ID of the VM. <source>: <string>...

Instead of using qemu-img convert, it's easier to use qm importdisk

1. Yes 2. I never got a corrupted vzdump backup 3. I usually make both vzdump backups and Veeam Agent backup, I use Veeam to restore individual files and vzdump to restore full VM

Have you tried to move swap to RAM with ZRAM?

I removed swap to zvol in every proxmox server I manage and used some RAM with ZRAM for swap, following this guide https://pve.proxmox.com/wiki/Zram

Why not backup to NAS via NFS/CIFS ?

Every time I find problems with time sync, I use chrony

Can you switch to legacy boot in BIOS?

Vmware offer NO integrated backup solution, you have to buy veeam...

What is in your /etc/apt/sources.list and content in /etc/apt/sources.list.d/ ?

The ZFS Event Daemon (zed) is in the systemd unit zfs-zed, so to restart it you have to use: systemctl restart zfs-zed The path to the zed executable is strange, in fact I have $ systemctl status zfs-zed ● zfs-zed.service - ZFS Event Daemon (zed) Loaded: loaded...

Have you added the pool in the Storage tab ?

In Options tab of a VM you can change SMBIOS settings as you like

In the storage GUI, you can choose on which nodes that storage is enabled

Without RAID 1, in case of a SSD failure, your server will have a downtime, because you have to reinstall Proxmox and recover the VMs and configuration. I won't do that. Don't do that, use the whole SSD for your fast pool, if you want more ARC cache, add RAM, always better than ARC L2 What is...

Buy another 500 gb ssd, then install proxmox on zfs raid 1 of both ssd, use the rpool (ssd raid1) for VM disks that need speed (operating systems, databases, and so on) Create a zfs RAID10 on the 4 spinning disks and use this pool for VM disks that store less used datas or datas that need less...

Have you tried job-start and job-end instead of backup-start and backup-end ?

It's changed in the last versions of the installer, now you can reserve some free space on the disk/disks when you install Proxmox and then you can configure swap on that free space I never needed to do that, it can be dependent on your hardware, your workload, and so on Official Proxmox...

Your statement is false. Just keep watching the ARC size with arcstat 1 and you'll see by yourself that ARC allocation is dynamic, it grows up when there are request and free memory and it shrinks when there memory is needed (example: you start another VM and there is not enough free RAM). But...