[pve-devel] [PATCH qemu-server 1/2] backup: prepare: fix format detection for disks without storage ID

[Friedrich Weber]

Tested-by: Friedrich Weber <f.weber at proxmox.com>

Checked the following:

* PVE 7.3: create VM with a passed-through disk, backup works
* Upgrade to PVE 7.4: backup fails with "no storage ID specified" error
* Applied this patch: backup works again

Tested with backup to local directory as well as PBS.