Helping people with computers... one answer at a time.
Your computer's BIOS is not typically backed up. I'll look at why, and whether you should be concerned about backwards compatibility when upgrading it.
Ever since I got my computer with Win 7 Pro in Dec 09, I've been faithfully backing up and making system images with the built-in Backup and Restore feature. When I got my laptop it had BIOS version A04 installed by the factory. I've since upgraded to version A08 based on a recommendation by the built-in Dell diagnostics utility. On the Dell support website (drivers and downloads) version A08 is the only listed BIOS for the Vostro 1520.
If I understand things correctly (not always the case!) the BIOS resides as flash software within the CPU which is on the motherboard. It's the BIOS that kick-starts the operating system. If the BIOS becomes corrupted or fails, your computer becomes a paperweight. During a backup, system image, or creating a restore point, only the hard drive is copied. The BIOS is NOT included. I can verify this if I use the Dell Recovery Manager and return my computer to factory settings or use one of my earlier system images. All of the junkware returns, but the BIOS still shows as A08 at startup.
When a person updates his/her BIOS, will it be backwards compatible? In other words, if a computer experiences issues and the BIOS is updated as part of the corrective action, and then the computer has to be returned to it's original factory state, or to an earlier system image, will the newest BIOS always be compatible? If there's a chance the BIOS will not be compatible how does one make a backup of the earlier BIOS(es) if they're no longer supported or available at the Dell website?
You have a very good understanding of what a BIOS is, where it lives and how it's not backed up. In fact, I feel like you've written half my article for me.
But you also raise a very important question about backwards compatibility. I'll address that, and clarify a couple of the items you mention.
The BIOS doesn't really reside "within" the CPU, rather it's typically a separate chip on the motherboard. The difference is perhaps a technical one, but what's important is that the BIOS is not stored on your hard disk or, for that matter, related to your operating system in any practical way.
The most important point is that the BIOS is not backed up by backup software.
There are many reasons for this, perhaps the most common is the practicality of a backup program restoring it. While there's certainly a standard - perhaps one of the oldest PC standards - about reading the BIOS there's no standard way to write to it. Backup programs might be able to save a copy of the BIOS, but if you ever needed that copy they wouldn't really know what to do with it.
Add to that the fact that the BIOS is typically somewhat complex to write to, and the result is that it rarely needs to be "recovered" in the same sense that data on your hard drive might need to be.
Bottom line: backing up a BIOS isn't really all that necessary or useful.
The only way I really know to backup BIOS would be to download the BIOS update utility from your computer manufacturer that corresponds to the version of the BIOS you have in your machine. If you ever need to re-flash it, you'd have that utility to do so.
The days of a corrupt or failed BIOS turning a computer into a paperweight are, fortunately, pretty much behind us. Most motherboards have some way to reset the BIOS to some initial state or version - often with a jumper or connector you physically move on the board. Once the original factory-default BIOS has been put into place, you can then typically use the downloaded update utility to then take it to a more current version.
Almost by definition BIOS updates, when installed on the motherboards that they are intended to support, must always be backwards compatible. I've not heard of a case where they're not.
There is a theoretical problem if some random software relies on a bug in the BIOS that is subsequently corrected, but that's extremely rare, and in most cases fixing the BIOS issue are more important than a badly behaved application.
In general, however, you should feel safe updating a BIOS, as long as you're doing so with the correct version for your specific motherboard.
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