Should I load Mountain Lion to a backup disc?

My MacBook Pro (late-2011, 2.4 GHz Intel Core it, 4GB memory) has had some disc corruption issues recently.
I reloaded Lion but some issues persist.  I intend to upgrade to ML but am wondering if there's a way to save
ML on an external drive (like a thumb drive) to keep for when the MBP fails again and the RecoveryHD isn't seen
--which is what happened recently.  I had to download the OS in order to reinstall Lion. Download speed is slow here.
Can I download ML to a flash drive and install it on my MBP if I need to after the initial install?

How to create a bootable, backup Mountain Lion install disk
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How To Make A Bootable Disk Or USB Drive Of OS X Mountain Lion ...
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