Volume or Disk Group?

[Jeje2]

Just bought a DS412+ with 2 WD30EFRX hard-drives.

Reading the manual in chapter 4 they describe to ways of managing storage space: Volume and Disk group

Which one should one use?
System is for home network usage, with plan to get more hard drives as needed (and then migrate to RAID 5)

Any and all suggestions are welcome - me confused ATM

 

[stevech]

My choice was:
A two drive NAS product. I don't need more than 2 or so TB.
Two volumes, one on each drive.
One volume is the main store with shares out to PCs on the LAN and selected ones to the Internet.
The second volume is a time backup (DSM utility) of the main volume. I can go back months to get an old file. In this, I omit folders with huge files that aren't important such as my drive images from PCs... no need to backup a backup.

This non-RAID scheme protects from disk failure and from file system corruption.

And of course, an external drive (eSATA or USB3 in my case), for a true backup of the key folders on the NAS, and anti-theft protection.