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Google Docs, a part of Google Drive, has a great revision history feature. The revision history show the changes that have been made to your document and make it really easy to roll back to an earlier version (no more cold sweats when you realise you've accidently deleted a section of your document!). It's also a really handy tool to see who has been editing the document and what changes have been made.
If you'd like some more tips on Google Drive, check out our other 1minuteCPD videos.