Shrink Qcow2 Disk Files - Proxmox VE
Over time a guest's *.qcow2 disk files can grow larger than the actual data stored within them, this happens because the Guest OS normally only marks a deleted File as zero, it doesn't gets actually deleted (performance reasons), so the underlying qcow2 file cannot differentiate between allocated and used and allocated but not used storage. In order to shrink the *.qcow2 files you've two options,
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fstrim(8) - Linux manual page