Media for Webcams vc CCTV for security

Webcams vc CCTV for security

Google didn't get me a 'general overview' - just specifics. like:

formatting link

have pointers to webpages for info on practical differences between using PC based CCTV vs webcams ? To use as security for ( remote ? ) monitoring of a house/store ? ( whether wired or wireless). Nothing specific: I'm just looking to get educated to know the pros / cons of either way.

Things like:

1.Why would someone choose one method over another ? 2.With CCTV you need to run coax cable ( limit x feet) and with webcams you use 'xx type cable' and the limit is xx feet. Is it mostly cable length the main reason to go with coax ?

If small house/condo does it matter ?
I can see that wireless would be easier to setup, but if not wired cameras, easy for 'bad guys' to jam the signal ?

Recording styles -

Do they both take pictures periodically and save to disk ? Or is CCTV constantly saving?
Recording everything vs recording just an alarm condition ( and how to set it ?)
Is it legal to record audio with a store camera, or this that an invasion of privacy ?
For the PC based stuff, how to setup " an alarm condition?" so that you don't have to be watching the screen and do a screen capture to save the picture? or accidentally overwrite it ?

I can see that 'older versions' recorded to VHS and needed a human to replace the tape, but do non-vhs based systems ( writing to disk rather than tape) overwrite themselves every x minutes ( variable setting) ? And how much disk space to allow for x hours of video ? ( I can see that it would depend on how many cameras/frames per second etc , but how to determine how much to allow)

How about if NOT recording, but want to just have cameras to access your home via internet when desired ... need remote PC online via high-speed and a static IP for that ? again CCTV vs webcams - other than quality any reason for one over another ?

Thanks for any links/pointers.