After changing schedules, did you click Apply? Nothing will be saved until this is done
Schedules are kept in
Windows Cell Manager
ProgramData -> Omniback -> Config -> Server -> Schedules For File system backups
ProgramData -> Omniback -> Config -> Server -> Barschedules For Application Backups
UNIX cell manager
/etc/opt/omni/server/schedules For File System Backups
/etc/opt/omni/server/barschedules For Application Backups