Member Since: Jan 23, 2009
Location: Born in Scotland, Worked in Scotland then England, Now live in Wales
Mac Specs: 2010 27" iMac 16GB RAM, SSD & 1TB IHD (Lion) + 2013 27" iMac Fusion SSD & 3TB IHD, 32GB (Mavericks)
03-04-2011, 04:06 PM
It is hardly my place to advise you to spend your hard earned cash; but what I would say is this:
A brand new EHD from, say, LaCie or Seagate or WD (500GB) is not expensive and most come with the capability of a connection via Firewire 400 or 800 both of which are greatly faster than USB 2.
Moreover, the latest are set up for Mac Time Machine (TM) either from the factory or simply by reformatting to Mac OS Extended (Journaled).
The one thing that you must, must, have is a totally reliable Backup system and Time Machine (TM) does the job very well. It backs up hourly for 24 hours, daily for a month and so on. If on a vital job, you can force an immediate Backup by clicking on the TM on the Toolbar and clicking on "Back Up Now". It's probably a good thing to do anyway just before you shut down or sleep; and at the beginning of your first session of the day.
I agree with Chappers in that your EHD might well be at or near the end of its useful life. Don't risk it. If you have the slightest doubt, but a new one. As I say, they are remarkably cheap these days, especially compared to what you laid out on getting your brand new iMac 27.