I have been sweating it for a little while now, having missed my HDD rotation schedule due to the unexpected prices (fallout from the 2012 floods in Thailand) and have been hoping to delay the purcahse of new HDDs until prices were close enough to my planned upgrade point. This however means I am nearing the critical storage mark within my system and its backup layers, prices are still not as low as I had hoped but at the same time the unrest in Thailand worries me.
The planned rotation would be:
-replace 500GB scratch drive (this one worries me, HD Sentinel tells me to monitor as error levels are high)
-upgrade 1TB storage (only have 150GB left)
-upgrade 2TB backup (currently a WD GREEN)
-fill out NAS (2x empty slots atm, 2x2TB WD RED - ie buy 2x 3-4TB NAS Drivers either WD Red or Seagate NAS)
Should I:
a) buy enough to see me by (ie buy a 4TB to go into the backup, bump the 2tb into main storage and the 1tb as scratch, retiring the 500GB)
b) as a) but buy 2x3TB for NAS at same time
c) complete full rotation/upgrade
TL:DR
should I buy more HDD's in case Thailand goes to shit and prices skyrocket again.
Apart from that one incident, hard drives drop down in price so you should only buy it as you need it. If I'd were you I only replace that 500GB hard drive.