Yes. For your Google Drive, Contacts, and Calendar backups, we do support versioning and we currently keep all versions of the record in your backups.
We run backup jobs once a day for Google Apps services. So, when we run the daily job, if an existing backup record has been modified or updated since the last version that we backed up, then we will pull over that new version and keep the old version in your backups for you to get to if an older version is needed.
To get a previous version of a backed up record, from the record metadata panel, click the "download previous versions" drop-down to see the older versions of the record that we have backed up. Select a date from the drop down and you will be able to download the record as it was on that date.
Note: Backupify/Datto SaaS Protection for Google Apps Enterprise customers receive three versions of each document due to the three times daily backups that run on those domains.