DVR or NVR which one?

[titang9 0]

Greetings, I'm a beginner concerning cameras.

I need a compatible NVR or DVR for these 2 (two) DAHUA cameras. 

XS-4MPVFIP

4MP (Max 4MP@20fps), 4 megapixel scan, H.264 High Profile, Metal (IP66)

(IK10), Up to 150ft / Low lux, DNR/Smart IR/ICR/WDR, POE / 2.8~12mm

They are connected by an ETHERNET cable to a TP-LINK (TL-SF 1008P). 

They were using a hard drive to record24/7.

Any recommendations? or if I need to change anything??