Restore container faild, no space left on device

Hi,
because no one in German forum could help me fix the problem i try my luck here.

Im on Proxmox 8.3
5 Linux Container Runnning

Diskspace:
local = 100GB
local-lvm = 900GB
NFS-Storage =2 TB (Synology for Backups)

My Problem:
I got an backup from an actual running machine and want to set it up temporarily in a container to extract datas, then it can be delete.
I cant get the Backup running, allways get the Message "no space left on device"
The Backup File has 4GB and extracted around 32...

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