Metadata backups aren't in /etc/:
<code>
[~] # cp /mnt/HDA_ROOT/.config/lvm/archive/vg1_00048-1234801235.vg ./md1_metadata_backup
</code>
Recreate metadata:
<code>
pvcreate -ff -u 9uE7j7-af57-MOhy-0o3c-AkBx-jifb-c1WriB --restorefile ./md1_metadata_backup /dev/md1
</code>
Pray:
<code>
vgcfgrestore -f ./md1_metadata_backup vg1
</code>
Qnap Rediscovery:
<code>
/etc/init.d/init_lvm.sh
</code>

Wait do filesystem check and wait for e2fsck to delete everything and restore from backups.