CUPS stands for Common UNIX Printing System. Lpadmin is a command line tool used to configure printer and class queues provided by CUPS. A system running CUPS is a host that can accept print jobs from client computers, process them, and send them to the appropriate printer. Sep 10, 2019  CUPS is a standards-based, open source printing system developed by Apple Inc. For macOS® and other UNIX®-like operating systems. CUPS uses the Internet Printing Protocol ('IPP') and provides System V and Berkeley command-line interfaces, a web interface, and a C API to manage printers and print jobs.

I think the misunderstanding is in using the term printer cache. I am not sure what you mean by that. I took a look at Onyx in Lion and the only item I could find that might be what you mean is CUPS jobs. Is this what you mean?

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At least in Lion, when only the CUPS jobs was checked, it did not delete the jobs that were queued up to print.

The only way to be sure if yoiur print jobs were retained is to use the Terminal command: Howto logout of visual studio for mac.

sudo ls /private/var/spool/cups

You will be prompted for your password which will not appear as you type it. Any files that begin with the letter 'd' are your queued print jobs. Any files that begin with the letter 'c' are the parameters for the corresponding print job.

If you don't find any queued print jobs by using that Terminal command, you have lost your print jobs. Time Machine does not back up any of the spooled jobs or the control files from /var/spool/cups.