When you need to migrate your Proxmox server, the easiest method is create Snapshot backup and copy to new server via ssh transfer (scp).
If your new server's primary disk has less space to import VZ Dump file, create a directory and add as Backup Dump storage.
I assume your new server has RAIDZ as Raid-5, so you may have the path /raid5/
So, create a directory in /raid5/ as the huge space is available there.
mkdir /raid5/vzdumprestore
Then add the directory to Datacenter>Storage>Directory
Create a test Backup in new server to prepare the backup location. This test will create a dump folder automatically in /raid5/vzdumprestore
Then use scp to SSH transfer the snapshot file from old server:
scp root@192.old.server.2:/var/lib/vz/dump/vm100backup.vma.zst /raid5/vzdumprestore/dump/
Wait for the transfer to finish, then restore the file in new server.
Note: the *.vma.zst file should be renamed as it was exact in old server when the backup was created, file name matter to restore in new server !
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