Google Docs backup is very incomplete regarding a file's metadata – only the "starred" status is backed up. In order to really have peace of mind regarding a Google Docs account – especially for one with a huge number of documents – a backup/restore of

- description [important]
- collections itself (and their hierarchies) [very important]
- the collections a file belongs to [very important]
- the versions of a file (for non-Google-Docs files) [less important]
- the sharing settings [important]
- the "Last modified" timestamp and account [nice to have]
- the "Last viewed" timestamp and account [nice to have]

is needed as well.

I think, the term "valuable data" does not only apply to a file as such, but also to its metadata. Imagine a piece of paper (file) with a headline (file name) "Love letter", a text (content) "Oh my dear, I love you so much" and a little golden star (is:starred) put on it – that's all you actually can backup/restore from/to a Google Docs account at the moment. It's useless unless you also know who wrote it (You? Your mother? The woman or man you adore? Or that fat old bad-smelling something sitting next to you in the bus every morning? :D ), under which circumstances (Real love? Or just alcohol?) it was written, whether it's a good idea to leave it on your kitchen table or not and so on. And that's the meaning of metadata ;)

I don't archive my love letters at Google Docs, but even stupid business stuff needs metadata to be usable ("Is the file 'scan_4203141592.pdf' an invoice from 2008? Or a letter from 2005? Should my assistant have access to it?"…).

So I hope you will implement Google Docs metadata backup soon. Thank you in advance.