Re: Oracle Backup Strategy re: online redo log backup

You can backup all the datafile by putting all the tablespaces in backup mode at the same time(although this is not recommended as it generates more redo during that period). But your redo logs may not be usable if you back them up. All you need is the archive log files generated between the start and end of the backup.
Your backup strategy can be like this

1)Find the current log info ARCHIVE LOG LIST
1)put all tablespaces in backup mode.
2)backup all the datafiles.
3)find the current log info ARCHIVE LOG LIST
4)Archive the current log

 ALTER SYSTEM SWITCH LOGFILE followed by  ALTER SYSTEM ARCHIVE LOG ALL
5)backup the archive logs.

In case of a restore.

1)restore the datafiles 
2)recreate the controlfile using RESETLOGS clause
3)open the database using the RESETLOGS clause.