How do I test my wallet backup? I follow the instructions for wallet backup and save them digitally. What's a convenient way to occasionally test my wallet backup. I want to make sure that I'm not doing something stupid &amp; my backup method isn't creating unrecoverable garbage. 

I can think of 2 ways for testing  


Install the bitcoin client on another computer and import the backup &amp; check balances
Rename my installed folder on the existing computer &amp; do a fresh install on the existing computer. 


But these methods are not very convenient. Is there a smarter way around it? e.g. a command line tool that'll check the file integrity and spit out some data with which you are reasonably confident that it's your wallet and has the right amount of coins.
You can configure Bitcoin QT to use a specific data directory, but it only looks in that place for wallet.dat.  

I would (1) close Bitcoin QT, (2) move the existing [data directory]\wallet.dat to another folder (3) copy your backup into the [data directory], and (4) reopen Bitcoin QT. 

Don't overwrite your existing wallet.dat with the backup!  Step (2) is pretty important in case there's a problem with the backup file.