There once was a time when you could backup your Steam library in a more manual way. It felt like some kind of smart hack to copy a game folder over to another machine, start the download and watch Steam slowly figure out that everything it was attempting to pull from its main server was already there.
But it was still a pain to do something a little more simple. With people commonly running multiple hard-drives in a single machine these days, managing your install locations through Steam started to show the client's inability to keep up with the recent trends.
But it seems as is Valve has finally decided to work on it. Though some can't seem to replicate the findings of others, there's talk as to whether this update is being rolled out slowly between user clients or whether it's only available with certain games for the time being. Having checked my lastest beta build, there's nothing different about my game's 'local files' tab, so it's difficult to say.
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But the evidence is overwhelming in the courts of Gamewatcher. Users are reporting - and screen-grabbing - images of an option within the Steam UI allowing them to quickly move the install folder of one game to another location. Handy for when you're done running on commonly accessed game on a clogged up SSD and would rather it be shifted over to the back of a milk-float to make room for something else.
Maybe it's already common place by the time this post goes live. Lets hope so. Steam has needed something like this for a long time. Downloading 70GB worth of DOOM again is something we'd see in our nightmares.