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The “Source and Destination” frame shows the name of the source (“Virtual tape”)
and destination (“Physical tape”) for offloading the tape.

Click “Select VT to offload...”, and then choose the virtual tape to set the source.

“Offload status” shows the status for the selected virtual tape to be offloaded:

Wait for backup – The job will wait for a backup to the virtual tape before starting
the offload. You can toggle this flag from the “Setup offload...” option.

Needs offload – The virtual tape needs to be offloaded to physical tape.

In progress – The offload is already in progress; see the “Jobs” tab.

PT same as VT – The virtual tape has already been offloaded to the physical
tape. There is no work to be done now, but if you have the job run continuously
then any future backups will be offloaded.

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Load tape onto disk...

Use this option to import the data from your physical tapes into the disk cache
using “Load tape onto disk...”. Note, you can also do this by selecting the “Setup
offload...” option, and then the “Copy PT -> VT” option for the “Action”, which is
the preferred way if you intend to append to the backup and offload the appended
data back to the physical tape. If you want to import the data for restoring from the
disk cache, then “Load tapes onto disk...” is easier. 

To import the data from the physical tape, you will need to create one virtual tape
for each physical tape being imported that has enough capacity to hold the tape’s
data after decompression. Make sure the virtual tape is safe to overwrite and not
mounted in any virtual drive. Then, select “Load tape onto disk...” to create the
jobs that will do the copying.