yep the grace period ends at the end of July and I think its something like £90.00 a licence after that? you can however upgrade a PC to 10 now and get it activated for free, roll it back to your present os and then just roll it forward when you are ready if you wish and the key will still stay (as long as no significant hardware changes have been made).
When you say 'backup' system, what EXACTLY do you mean by that please?
(e.g. I am currently on Win 10 on my new laptop, so how EXACTLY would you suggest I back it up first if I decide to install Win 8.1 on it?)
Well I DID quite like 8.1 on my previous laptop and have been more than put off by seemingly all and sundry from Windows 10 these past few months - hence my query as to how to actually backup my new Win 10 'just in case' I revert to an older system such as 8.1 or even 7 - surely that makes good sense?
(Plus still no real reply as to how IN DETAIL please, to backup my Win 10)
Sorry alimac but I need to put this right. Downgrading an os is nothing like reverse engineering. I have reverse engineered many a faulty section of electronic equipment. This becomes necessary when no circuit diagrams are available and involves drawing your own circuit and consulting datasheets. I can only do this on single and double sided boards. A lot of equipment nowadays use multilayer boards and only the big boys with big money can reverse engineer those.
Large companies may possibly do this on their competitors equipment. The military often did it on enemy downed aircraft.
Reverse engineering software would involve disassembly of the code and studying it line by line.
Erasing a hard drive and inserting a windows disc cannot in any way be classed as reverse engineering.