I don't see anything wrong with keeping the graphics card unless it causes you problems.
By microcam you mean pinhole? Andy sells one on aliexpress: US $182.39 5% OFF|Aliexpress.com : Buy IPC HUM8230 2MP Covert Network Camera IPC...
This is why you don't buy cheap Chinese crap cameras....
Make sure its not an onvif authentication issue.
Setting-->General-->DATE&TIME --> Check NTP and put in server info
You should also check out freenas
There is an ftp tab where you can use an ftp server to save files. Its definitely possible
EDIT: Dahua Wiki: NVR/Recording Setup/NAS Recording...
If you want to be completely minimalist, use the rtsp urls and put them into VLC
There are 64 channel dvrs.
Again, DO NOT DO THIS you will waste your money and it won't work, also how far away are the cameras, USB has a...
Did you try changing the DST adjustment settings in the camera?
Like @Mike said use the BI app.
Ive never use NTP but a quick search gives me: NIST Internet Time Service
Your not the first person to have this problem: DS-2CD2332-I time issues
Put in an NTP server for your time zone. Refer to the thread I posted above.
Well you need a VMS. Do you need to save video? If so you need a VMS like Blue Iris. If not just use SmartPss. For analog cameras you need a dvr....
Again, this is a problem that happens with China hacked cameras. Can you change the ntp server?
Separate names with a comma.