RAID is not a replacement for a backup! Here's why.
From the web console, I see that the model number is:
TS-RHTGL/R5 F/W 1.26
When I hop on the download page, I am given choices:
TS-RH1.0TGL/R5
TS-RH2.0TGL/R5
TS-RH4.0TGL/R5
TS-RH6.0TGL/R5
TS-RH8.0TGL/R5
TIA for your help!
The number following the RH is the capacity of your unit. Pick the one that has your capacity.