HP D2D Manual page 22

2. On the next step of the wizard set the allocation policy, by changing the Usage to Non
Appendable. This ensures that all backups start a new backup file rather than appending to
a backup file from a previous backup. In turn, this prevents a large housekeeping overhead
when the appended file is overwritten.
Leave Allocation set to Loose; this will enable the use of any suitable media rather than requiring
a specific media file, which often results in backup failure.
Do not select Allocate unformatted media first or Use Free Pool.
Click Next.
22 Configure a backup rotation scheme