1. prep

  • external usb disk is /dev/sdb

  • is partitioned with an extented and a logical partition 

    lsblk /dev/sdb
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sdb      8:16   0 111.8G  0 disk
├─sdb1   8:17   0     1K  0 part
└─sdb5   8:21   0 111.8G  0 part
mkfs.ext4 -m 0.1 -L data2 /dev/sdb5
mkdir -p /data2
mount -v LABEL=data2 /data2/
mkdir -p /data2/bare/

2. backup

vzdump 102 --mode "snapshot" --dumpdir "/data2/bare/" --compress "zstd"

3. restore

qm list | grep -w "102" && qm destroy "102"
qmrestore "$(ls -1 /data2/bare/*102*vma.zst)" "102"
qm start "102"

4. reference

https://pve.proxmox.com/pve-docs-6/chapter-vzdump.html

https://d01cid.ddns.net/adoc/proxmox/bar.html