With document ID c03753986 on 2013/05/06 an advisory for HP Data Protector 6.11, 6.20, 6.21, 7.0 and 7.01 was released, describing a problem for restores of SAP data files and the file size is different from the SAP data file. When the omnirc parameter OB2SAPALIGN was used on Unix a possible read error is not reported during the backup and in case of restore you may receive an error and are unable to recover the SAP data file (silent data loss).
As a workaround disable the omnirc variable OB2SAPALIGN=0 on the SAP client. The problem will be solved with the next release of HP Data Protector.
The complete advisory can be read here: http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?spf_p.tpst=kbDocDisplay&spf_p.prp_kbDocDisplay=wsrp-navigationalState%3DdocId%253Demr_na-c03753986-1%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken