Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

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Thank you both (skaarj80 and CTHTC) for super quick response and for activating my account :-)
EDIT: OMG, ToUrNiQuEt also already posted an answer, I'm just reading it. Thank you so much the three of you, you guys are crazy :-) You are answering my questions too quick, I cannot type that fast haha :-)

I'm sad to hear if they didn't correctly mention the source and the efforts of your community members in the article at Windows United, I only read the article about Project Astoria on the windowscentral page and I see they named developers there ('As reported by Windows United, two developers, Fadil Fadz and one who goes by Tourniquet, have released a tool for getting Microsoft's abandoned Project Astoria to run on Windows Phones.').

Thank you for the quick guidelines regarding ToUrNiQuEt's method, I will start getting info from that forum for more details :-)

Uh, I really hope the camera won't have much issues, that's actually the most important feature on that phone for my father. And he also wants to have Whatsapp installed after the support for it will come to an end on Windows platform.

OK, I will let you know if I'll have more questions.

And please if anyone else can share their experience regarding camera on Lumia 1020 after getting upgrade to Windows 10 Mobile. On some of the xda-developers forum pages I read that all went fine with camera functioning back to normal after the upgrade and a reset (don't remember was it a hard of factory reset).

Btw, is there a way to get the phone back to the current Windows 8.1 in case the upgrade to Windows 10 won't be satisfactory concerning the camera or others apps behavior?
Is there a way to make a complete backup of the current phone state (or some sort of an OS image with all the installed apps) in case anything goes wrong?

Thank you once again!