Non-Google apps aren't included. It's just all your Google account stuff - emails, contacts, calendars, photos, music, files in Drive, G+ postings, etc. that you pick what you do and don't want included, then choose what archive file type your prefer, and when you're done you just have to wait until our Google overlord compresses everything you've chosen into a file. Might take an hour, might take several. Depends on how long you've had your Google account and how much stuff you've accumulated. You'll get an email when it's done with a link to download the file that could be several hundred MBs or more. Your mail is saved as .mbox, Contacts as .vcf, bookmarks as .html, calendar as .ics so generally you're getting file types that are commonly exportable/importable.