Unfortunately this machine does not have onboard graphics. My other desktop does. I have it as a fallback.
I agree what @kovacslt says makes sense. I will do it carefully though.
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The cpu could be changed, is it AMD or Intel?
Yes it does? Not sure on how to add a line to my sources.list?
If the motherboard doesn’t have the outputs, it will not help.
If the motherboard is equipped with DVI/DSUB/HDMI output, but those aren’t working, because the CPU lacks the GPU, then yes, a proper CPU upgrade could help.
sudo nano /etc/apt/sources.list
end edit…
or:
sudo echo "deb http://deb.debian.org/debian bullseye-backports main contrib non-free" >> /etc/apt/sources.list
There are probably countless ways to do it.
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About all AMD boards I have seen, have the outputs, Intel boards sometimes do not, and most AMD cpu have onboard graphics. I need the mobo model#?
Can I do it with Synaptic package manager and if so, do I use "Binary (deb) or Source (deb-src)
Yes.
In synaptic’s menu:
Settings/Repositories
In the dialog choose “other software”, then click “Add” button.
Add the line.
It’s about binary .deb, not src.
Let me ask back: is that simpler, then add the line via nano, or just copy the command I wrote, paste into terminal, and execute? 
I updated the sources.list with nano? Do I need to run update-grub before the kernel upgrade?
I see no bkup app, like Timeshift, what do I need to install for bkup?
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Its intel, I will look up its number.
The desktop is more than 10 years old, the motherboard only supports ddr3 ram, the graphics card is in a pcie3 slot and its a pcie4 card.
So a cpu upgrade probably does not make sense.
It does have a lot of ram (64Gb), so it keeps up with modern machines quite well.
Easy, you just add it with an editor. Make a copy first, ie
cp sources.list sources.list.old
vi sources.list
or whatever your favourite editor is.
My sources.list file already has the necessary backport lines.
I dont think the motherboard has the outouts.
So thats not a path to go down.
I think, get the right kernel is the way to go.
Mine is an Intel DP43bf with 8GB ram, with no onboard graphics but my Intel Asus P8Z77 V LX does both use DDR3 ram.
Do your backup from outside Debian… ie another Linux or something like Clonezilla on a DVD. The partition needs to be unmounted while you backup.
You can just use rsync from anothe Linux, and copy the whole root partition to another place… That is probably how I will do it.
My first thought was to use timeshift and bkup to an .ext4 partition on another disk. Not sure on how to use rsync.
Machine: Type: Desktop Mobo: ASUSTeK model: P9X79 DELUXE v: Rev 1.xx serial: UEFI: American Megatrends v: 1203 date: 05/24/2012 CPU: Info: 6-Core model: Intel Core i7-3930K bits: 64 type: MT MCP arch: Sandy Bridge family: 6 model-id: 2D (45) stepping: 7 microcode: 71A cache: L2: 12 MiB flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 76843 Speed: 2532 MHz min/max: 1200/5700 MHz Core speeds (MHz): 1: 2532 2: 2745 3: 3093 4: 2034 5: 1547 6: 3324 7: 2371 8: 2899 9: 3265 10: 2269 11: 3500 12: 2761
Will get you a recipe.
Need to look it up.
I use it for moving installed distros between machines.
Nope, it has no graphics output!!!
I will just use timeshift.
I will get the rsync stuff tomorrow… it is useful.
This seems to be the official doc on backports