Veeam Backup & Replication offers the capability to assign location tags to different components within the backup infrastructure, including vCenter servers. This feature is particularly useful for GDPR compliance, as it allows administrators to specify the physical location of the data processed and stored within vCenter servers, helping to ensure that data sovereignty and regulatory requirements are met.

Given the proxy load of 68% and all other loads (source, network, target) at 0%, the bottleneck is at the proxy.
To decrease the backup processing time and accommodate the growth of the environment,adding additional Windows or Linux machines as backup proxies would help distribute the load. This would enable parallel processing and reduce the time taken to complete the backup jobs, thereby helping to meet the RPOs.
References:
Veeam Backup & Replication User Guide: Backup Proxy
Veeam Help Center: Managing Backup Proxies

Explanation
https://helpcenter.veeam.com/docs/agentformac/userguide/system_requirements.html?ver=20 :
Backup Target
Backup can be performed to the following types of storage:
On-premises or cloud-based object storage
Local (internal) storage of the protected computer (not recommended)
Direct attached storage (DAS), such as USB, eSATA or Firewire external drives Network Attached Storage (NAS) able to represent itself as SMB (CIFS) share Veeam Backup & Replication 12 or later backup repository (including deduplication appliances) Veeam Cloud Connect 12 or later cloud repository