A simple Python script to download all your mail from Gmail to your local hard drive.

I love Gmail. But sometimes I worry that all my emails are stored on Google's servers and if they ever lost them, then I would be hurting in a bad way. And it would only be my own fault because I had never backed them up anywhere.

So I wrote a simple Python script to download all my emails and save them in files on my local hard drive. Sure, I could use another mail client, but I don't want to install more software on my computer than I need to. I don't want to worry about that database getting corrupted. I don't want to worry about whether several gigabytes of data is too much for it to handle. I don't want to worry about whether it's storing them in an efficient format, or building indexes it doesn't need to. And I don't really want it to store my Gmail password in some obfuscated format that other programs might be able to get access to.

1. Make sure IMAP is enabled in your Gmail settings.

2. cd into an empty directory where you want your emails downloaded.

3. Run python path-to-gmail-backup/dobackup.py and put in your Gmail address and password when prompted.

   2. Set env vars DOBACKUP_GMAIL_APP_USER and DOBACKUP_GMAIL_APP_PWD if you want to avoid manual input.

   3. Set env vars DOBACKUP_GMAIL_LABEL and DOBACKUP_SAVE_FOLDER if you want to target subsets of your email account, and save them someplace specific.

4. Your emails will be downloaded to the current directory and named 1.eml, 2.eml, etc.

5. Numbering is not necessarily sequential. The file is named after the message's "unique id", which, as part of the IMAP protocol, is assigned by Gmail and should stay the same forever. They look to be sequential but with numbers missing for messages that got deleted.

6. You can stop the process with a Ctrl+C if you need to. If you stop the process or it errors out, when you run it again it will pick up where it left off.

7. Attachments are not extracted into separate files, they're just embedded in the eml file as MIME attachments.

8. This is not intended to be a complete email client, just a simple failsafe in case Gmail ever loses your data. However, it does allow you to do things like sort by file size so you can see which emails to delete if you want to reclaim space in Gmail.

• Log in to Gmail with OAuth instead of Gmail password?