Description of problem:

When 'ephemeral-storage' is configured and running filesystem restore,

the "/var" partition on the worker increases. After the backup is completed the "cache" is left on the worker node and not deleted.

Only node-agent restart clears the "cache"

Version-Release number of selected component (if applicable):

OCP - 4.16.9

ODF - 4.16.1
OADP - 1.4.1-28
TC - Single namespace, Singe pod, PV size 1.2T , Total usage 1T (100 files x 10GB each, 2.4.1.9) 

How reproducible:

Steps to Reproduce:
1. Create a namespace with 1 pod, large PV & usage
2. Set DPA with "ephemeral-storage"
3. Run backup & restore
4. During restore monitor the worker node of node-agent (df -h /var)
5. "/var" capacity increases during the restore
6. Wait 30-60min , the "cache" is not deleted
7. restart the node-agent pod - "cache" deleted.

Actual results:

"Cache" left on the worker node

Expected results:

"Cache" deleted after restore completed

Additional info:

DPA setup:
  configuration:
    nodeAgent:
      enable: true
      podConfig:
        resourceAllocations:
          limits:
            ephemeral-storage: 400Gi
          requests:
            ephemeral-storage: 400Gi
      uploaderType: kopia

Worker node: (back to 6% after node-agent pod restart)
/dev/sdb4       447G   93G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   94G  354G  21% /var
/dev/sdb4       447G   93G  354G  21% /var
/dev/sdb4       447G  138G  309G  31% /var
/dev/sdb4       447G  178G  269G  40% /var
/dev/sdb4       447G  210G  237G  47% /var
/dev/sdb4       447G  241G  206G  54% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   25G  422G   6% /var
/dev/sdb4       447G   52G  395G  12% /var
/dev/sdb4       447G   95G  352G  22% /var
/dev/sdb4       447G  130G  317G  30% /var
/dev/sdb4       447G  165G  282G  37% /var
/dev/sdb4       447G  202G  245G  46% /var
/dev/sdb4       447G  237G  211G  53% /var
/dev/sdb4       447G   25G  422G   6% /var