Backup slow for linux server


Active Member
Sep 17, 2011
Hi Team,

I am running the latest version of proxmox. Server is IBMX3650 M3 with synology RS3614xs+ with SSD drives as storage. Synology is mounted as nfs to create a datastore for the vm storage. I have a windows 2012 vm running with 4 disk of 100GB but I have only 3 disk included in the backup. The backup for that windows VM takes 1 hour and 33 mins average with a total of 58.94GB and with zst. I have another VM running centos 7. Disk is 200GB and the time to do the backup takes 1 hour and 35 mins average with a total of 20.94 GB and with zst. Can anyone advise why its taking so long to backuphalf the amount of data.




Proxmox Staff Member
Staff member
Nov 19, 2018

the total size of the disk can be bigger, but that doesn't necessarily mean there's more data inside.

the size of backup depends on how much of the disk is filled.

please check how much data is actually in the disks


Active Member
Sep 17, 2011
Here is what I can find

Filesystem Size Used Avail Use% Mounted on
devtmpfs 5.8G 0 5.8G 0% /dev
tmpfs 5.8G 0 5.8G 0% /dev/shm
tmpfs 5.8G 169M 5.7G 3% /run
tmpfs 5.8G 0 5.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 50G 15G 36G 30% /
/dev/mapper/centos-home 126G 33M 126G 1% /home
/dev/sda1 497M 294M 204M 60% /boot
tmpfs 1.2G 0 1.2G 0% /run/user/0


The Proxmox community has been around for many years and offers help and support for Proxmox VE and Proxmox Mail Gateway. We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!