How do I protect my old IMac from the recent data breach. I have the High Sierra OS.

Please identify the model year iMac you own. If you don't know how, please click the in the upper left of the display and click About this Mac and it will tell you the model year of the iMac.

Then 10.13.6 is the last version of Mac OS it can run. It simply does not hvae the hardware to go beyond 0.13.6 and if you are curious, no the hardware cannot be upgraded. If you have a need to go beyond 10.13.6 then it is time to buy a newer iMac. Please remember your 2011 is considered vintage and has been for several years which means parts are not avialble for it.

If you have not been considering upgrading it, it may be time. If you cannot afford a brand new iMac there are multiple options you can consider that will get you where you want. If you need suggestions, speak up and we are happy to assist.

BTW, I also had a 2011 27" iMac up until last year which worked fine but I knew it was way over the hill then and replaced it about a year ago.