XEN Backup

Hi I have 2 identical hardware Dell poweredge servers.
One server is working all the time and the second one is backup Installed leap 15.3, xen, virtual server is tumbleweed.
I want to make weekly backups of the running virtual server without shutting down and transfer it to the backup server.
Tried taking snapshots (xl save / xl restore) but it doesn’t work well.
On the master server, the virtual machine shuts down, and on the backup server, grub crashes frequently.
Can you help in this matter?