run {
configure retention policy to recovery window of 14 days;
configure controlfile autobackup on;
configure controlfile autobackup format for device type disk to 'E:\backup\controlfile\bak_%F';
allocate channel c1 device type disk format  'E:\backup\data\bak_%u';
allocate channel c2 device type disk format 'E:\backup\data\bak_%u';
backup database skip inaccessible
plus archivelog filesperset 20
delete all input;
release channel c1;
release channel c2;
}
allocate channel for maintenance device type disk;
crosscheck backupset;
delete noprompt obsolete;