Good Day, Zeeshan
When facing issues it is always better to log a new thread than post on an old one.
How are all your backups executed, is it running from the crontab ?
are all the backups running as the same user ?
as a test do a
chmod -R 777 /oracle/SID/102_64/sapbackup
and rerun the bakcup
Best Regards
Marius