External hard drive not appearing when entering time machine.

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Why does my external hard drive back up on time machine ok, but when I enter time machine (and the external device isn't plugged in) i can't see it?
It appears in time machine fine when the external drive is plugged in, but just not if it's been ejected or
I want to have the ext drive backed up in case I lose it or it corrupts....and if that happens I won't be able to plug it in to see the drive in TM - does that make sense?
I am running OSX 10.9.3 on a Mid 2010 Mac Book Pro. The external drive is a samsung and is formatted to Mac OS Extended (journaled). Time Machine is a standard Apple one and has been working fine for a couple of years
Try holding down the Option Key when selecting the Time Machine menu, then select Brows Other Time Machine Disks. See if you can then browse the backup of that drive. The normal Time Machine display is kind of a “live” restore point thing, if that makes sense.
I’m not sure if there is anything in Pondini’s FAQ, but you might peruse it and see if he discusses that issue: http://pondini.org/TM/FAQ.html
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