afacey,
NDMP is much faster than NFS. In tests we've run in our lab using an LTO4 drive and comparing NFS to remote NDMP, we found remote NDMP to be 40% faster with a file size of 2 MB, 150% faster with a file size of 300KB and even faster as the f...
Although the tape belongs to the VTL and is now in the scratch pool, you may not know how much space that frees up. Most of the VTLs now allocate only a small amount of space for each virtual tape and allocate more as needed. So, although you might h...
You need to remember a VTL is tape to NBU. Although a backup image may expire, until all backup images on a piece of tape media expire, the tape cannot be reused, so space can't become available. That's a consequence of sequential media. When all ima...