HP Data Protector Express Basic-Software - Manual (Page 57)

Hint The text entered here will be added to the log file of an import job if the media later needs to be
imported and the incorrect passphrase is supplied. Use this field to create a reminder of the passphrase
as Data Protector Express cannot recover a lost passphrase.
Compression
Software encryption disables hardware compression, although you will still be able to select Software
compression.
If the backup device has hardware compression then performance will be better if only hardware
compression is used, and that there is little to no benefit of having both enabled. Enabling software
compression in this circumstance will reduce performance.
If Hardware encryption is selected, we recommend that Enable hardware compression is also selected.
Hardware encryption and hardware compression can be used on devices, such as the HP LTO-4 tape
drive without any loss of backup speed.
Key Management
Data Protector Express has adopted a very simple key management strategy. A media is encrypted
originally by configuring the job that creates it according to the parameters described above. From that
point on, the media is known to the catalog. As long as the media is known, restore jobs may use the
media without entering the passphrase again. If a media is unknown — because it was deleted from the
catalog or because it came from a different catalog — you must import the media to make it known to the
catalog again. The import process required you to supply the passphrase to complete the import. If the
passphrase supplied does not match that used to encrypt the media, then the hint supplied at encryption
time will be shown in the job log so you can try the import again.
When media is encrypted the media is depicted on the Jobs and Media view with a lock on it. The
Platinum colored lock indicates hardware, whereas the gold lock indicates software encryption. The
Media details window shows the type of encryption used.
User’s Guide 57