Copy Init.ora file.
SVMRGL> Alter system switch logfile
SVMGRL> alter database backup controlfile to trace;
SVRGRL> alter tablespace tablespace name begin backup
copy all the files of that TABLESPACE to disk by OS command.
SVRMGRL> Alter tablespace end backup
Repeat the steps until you complete all Tablespaces
SVRMGRL> alter system switch logfile
Copy the all log files and copy all Archive Logfiles generated from Begning the backup to Ending the backup

I hope it is clear now.