ESM 7.6 Archive restore failure

I have a problem with restore ESM Archives.
I have the second solution backup that I store Archives on NAS so they got offline on Command Center. Now i wanna to restore an archives for 10 month ago. My host /opt/ partition is reached to 12T limitation; so received " Max Storage limit reached_ " at making searchable the archives.
how can I solve my problem. where can I import my data.
NOTE: we cannot stop our services and my ESM Version is 7.6