Change Default Proxmox Backup file name

Good Day!

I try this command below to generate new backup file name in proxmox but when i check the file size, it seems theres a very big difference in the size of proxmox original generated file and the script that i made. Any help will be appreciated.

vzdump $i --stdexcludes --mode=suspend --compress=0 > $backupdir"VM"$i"backup".vma