Actually I have to write a plug-in for monitoring the DP backup system and this is what I should implement(see below). It is not possible to restore each file from GUI. Comparison approach is CRC32.
As you also here(http://h30499.www3.hp.com/t5/Data-Protector-Support-and-News/set-flag-after-each-backup/td-p/6555876#.U-Y4omNWmKJ) mentioned, there is no way of setting flag and I have to write a post-exec script.
define threshold
get list of all file systems
get list of excluded file systems (blacklist)
For each file system
get current machine name
get file system ID
If file system-ID is in blacklist
continue
If flag is not set on file system
error
get timestamp of last backup (from HP-DP or flag)
walk file system (go through every directory)
For each file in directory
If timestamp file > timestamp backup
go to next file
random number => r
If r < threshold
extract/restore file from HP-DP
If comparison fails
error
what do you suggest?