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Manual Save

Trigger a save manually: Blueprint: 
[Get Save Subsystem]
   ↓
[Flush Saves]
C++: 
USaveSubsystem* SaveSubsystem = GetWorld()->GetSubsystem<USaveSubsystem>();
SaveSubsystem->FlushSaves();

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Autosave

Configure automatic saves: 
SaveSubsystem->UpdateAutosaveInterval(300.0f);  // Save every 5 minutes
Default: 300 seconds (5 minutes)

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Mark Dirty

When data changes, mark as needing save: C++: 
void UInventoryComponent::AddItem(UItemDataAsset* ItemData, int32 Quantity)
{
    // ... add item logic ...

    // Mark for save
    USaveSubsystem* SaveSubsystem = GetWorld()->GetSubsystem<USaveSubsystem>();
    SaveSubsystem->MarkDirty(this);
}
Note: Most UMI components automatically mark themselves dirty on changes.