Google-drive – How to restore a Google apps user’s documents

In order to delete all of your Google Docs without using external software:

1. Sign into your Google Docs account
2. On the left hand side, there is a list of different pre-named folders like "Home" and "Starred". There should also be a label called "All Items"--select this.
3. You will see a list of all documents (and collections, if you have any). There will be a check box next to "Title" like this:
4. Select this box, and all of your documents will be selected
5. A new set of options will pop up above the list of documents. Click on the trash icon to delete all of your documents.

For new incoming emails: In settings, Forwarding and POP/IMAP, add a forwarding address. Also, you may want to set a filter "is:spam" then "Never send it to Spam" to also forward all emails. ( I prefer to have all my emails backed up, and manually remove spam later.)

For exisiting emails, first, in Google Apps email account, in settings, Forwarding and POP/IMAP, "Enable POP for all mail". then import them into your backup gmail account using POP3 in settings, Accounts and Import, "Import mail and contacts"

Important: In your main account, remember to select option to leave existing emails in your main account(In POP Download:, "2. When messages are accessed with POP keep Mail's copy in the Inbox"), else the import will move all the emails into your backup account.

Also, this might help: Migrating Gmail account to new Google Apps email and leaving a copy behind