Are empty registry keys safe to fix or delete?...

I didn't know that an external USB is compatible for this "Reflect image" you are saying. Windows 7 does have this "system image" form of backup and when I tried to use that to my external USB, it says that that its not compatible but would be if it was an external hard drive, not an external USB.

Are you saying that this "Reflect image" is a backup feature of this wonder tool, Macrium Reflect Free Edition that is in a sense different from the "system image" form of backup in Windows and is compatible with external USBs???

Thanks....

The Reflect image is just a file in Macrium's propriety format. You can store it wherever you like! You create an image that is split over a number of files ... for example if you want to burn it to disc.

I don't know, but I would presume it is not compatible with any Windows generated image. I don't know what W7 gives you in that respect.

Read up some more on the Reflect site, have a look at their forums and just download it and try it! That will tell you more than I can and you won't lose anything by doing that!

I've never tried Macrium Reflect with a USB flash drive which I'd actually be rather captious of using since the backup could be easily deleted. What I've did is made the rescue CDs, and burned the backup image onto multiple DVD discs. I also have that same backup image on a second hard drive which is going to be much faster to restore from and is less likely to have read issues like read errors when compared to optical media like CDs/DVDs.

Personally I wouldn't backup to CDs since I've seen them become unreadable in 2-5 years whereas with DVDs I haven't ever had one fail.

... you can create a rescue CD and restore the system from a Reflect image on an external USB drive - that's certainly how I've used it before.

That's hard drive; not flash memory stick.

I don't back up to disc media either; multiple copies across external USB drives.

And a very timeous testimony from Tasgandy ... http://forum.piriform.com/index.php?showtopic=26569&hl=