Gmail Accidentally Resets 150,000 Accounts
tsj5j writes "Many users have reported loss of their Gmail accounts, as they signed in to find their email accounts reset — losing years of email history. This appears to be a result of a bug which treats existing owners as new users. For those affected, Google is currently trying to resolve the problem. For the rest of us, perhaps this is a timely reminder to backup our data and be less trusting of the cloud."
A stand-alone application seems the safest way to go. Personally, I use MailStore (free home edition) to ensure a local backup of my Gmail mails.
I suspect offline access via Gears wouldn't help much in this case. It's supposed to stay in sync so I guess logging into an empty account would sync the local gears data into oblivion as well. The same would presumably be true of a local IMAP client (though that could at least be recovered from a backup and then opened in offline mode).
This is exactly why it's important to keep backups. Gmail Backup is a pretty straightforward way to back up your Gmail account. You can also use it to upload emails from one account into another.