[Q] Clarification on recovery

I was going through the thread , [15.11.2012][ICS]PhilZ Touch 3.00 - CWM Based Recovery 6.0.1.5 (Temporary flash) by Phil3759. It talks about flashing a temporary on a stock recovery. I have few queries about this (This is about the concept rather the actual method itself, so though its for S2, posting here)

1. If I understand correctly, stock samsung recovery (3e) looks for signed zips (signed by samsung). So either this is writen for older recovery (2e) which may have allowed unsigned zips OR stock recovery refers to something else (thats not from samsung)

2. If my understanding is correct, there is a separate recovery partition which holds its own recovery kernel separate from the normal boot kernel. In this background, what does flashing insecure kernel means? does this procedure replace the main android kernel? does this insecure kernel also act as recovery kernel when booted in recovery?

3. is there anyway to backup recovery partition (as far as I can think of, this may not be possible. As I have not seen any way to root SGR without installing custom recovery first. and through heimdall, I dont think a dump can be taken of partitions)

Thank you Adam77Root

Thank you Adam77Root, that cleared my doubts regarding the recovery.

What I was referring to was like the dump of the partition with dd (or probably tar). On linux, normally if you are not root, you wont have disk access (or unless you are part of disk group). Isn't it the same with android kernel as well?

I have found some info about backup of partiton through heimdall / odin. I am going through that. Will update later on that
( androidforums dot com/exhibit-4g-all-things-root/733167-how-tool-rom-sgh-t759-create-odin-heimdall-backups.html
http://xdaforums.com/showthread.php?t=1372455
)