Nandroid, which partitions to choose?

[CarloHD]

as the title suggests, what are the fundamental partitions to be included in the Nandroid?

3rdmodem,
Boot,
Recovery,
Cache,
Cust,
OEMinfo,
Data,
System,
Fastboot,
FRP,
E-Recovery,
Splash2,
Vendor,
Product,
Version,
System image,
Modem image,
Cust image

I think only the partitions we can modify, like system, data, boot, recovery, system image, but the others? Vendor? Cust? They're important?