It might perhaps be easier for you to use an FTP program to access the backups. For FTP, log in with the user/pass for the domain you're working on. Now on the side of your screen where it shows the server you're connected to, there's generally a line where it prints what directory you're in. Just click in there and add on after the / ".snapshot" with no spaces or anything. With luck that will put you into the directory and you can access your backup.
To use putty, bring up putty and connect to example.com (replacing with your domain). You'll be using the same log in as for FTP, however the use must have shell access enableld through the Panel > Users > Mange Users. If that hasn't been done already the change can take 15 min or more to take effect.
Once you've logged in type "cd .snapshot" and press enter. now type "ls" and press enter. that should print up a list of the directoires and files in your snapshot folder. Select which folder you want "cd folder" again.
Once you've found the file you need you can use "cp" to copy it out. if the file is called style.css and you want to move it to your home directory the command would look something like this:
cp style.css /home/username/
replace username with the user you logged in as.
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