Canon LBP7100Cn User Manual page 191

NOTE
Combined print data are not saved.
After the combined print data is printed, the print data is deleted from Canon PageComposer.
The print data is also deleted if Canon PageComposer is closed without printing the print data.
For more details on Canon PageComposer
See Help for Canon PageComposer.
Help is displayed by clicking [Help] in the [Help] menu.