HI, i have 2 clients that have no trace of begin backup and end backup in there oracle alert file.

The software that saves all files from the server to there tape backup takes backup of open files.

If my hard drives explodes, can i recover my database with all oracle files on the tape backup with no datafile taking in backup mode?

So my question is this: IN THE FILE "Orclalrt.log", IF THERES NO TRACE OF BEGIN AND END BACKUP, DOES THIS MEANS THAT THERES NO VALID BACKUP?