RAID 0 or 1 on my NAS - I Have Internet Backup

Hi Peoples,
So I am about to set up a simple home NAS in either 1TB RAID 1 or 2TB RAID 0. I am unsure which mode to set due to the factors I list below. Can you please offer me some guidance?

- I have a Carbonite internet backup account, so as long as I am a good citizen about making sure I back up to Carbonite I could go with RAID 0 with more confidence right? I mean if one of the HDDs fail I have my Carbonite backup.

- I am concerned with safety first (this is why I set up the NAS in the first place) so RAID-1 would be the most safe way to go.

- RAID 0 has better throughput and all but what I really would want from it is the extra terabyte of storage. I figure since my computers would be connecting to this NAS over an 802.11g network, the wireless would be the bottleneck throughput-wise right? So I am not really getting any throughput boost with RAID-0 and might as well go with RAID-1 to be safe right?

I hope this message makes sense. What it all boils down to is I would like to have 2TB if I could. I figure with my Carbonite backups I should be safe, right?

Here is my NAS (I know I know -I should have just set up an old computer, but this works for me for too many reasons to list here):
Synology Disk Station DS207+
2 X 1TB Western Digital WD10EADS (32MB Cache)

Thanks Again!!!