I got the below nice article about SharePoint Online backup and Restore by Threewill
http://www.threewill.com/the-4-options-you-need-to-know-about-sharepoint-online-backup-and-restore/
http://www.threewill.com/the-4-options-you-need-to-know-about-sharepoint-online-backup-and-restore/
- Use the recycle bin and version history.
- Use a 3rd party tool for backup and restore (there are several).
- Manually backup sites, lists, and libraries
- Create an Office 365 support request
- Site collection backups are performed every 12 hours and are kept for 14 days.
- If you want to restore a backup, you need to create a support ticket and specify the earliest backup time, latest backup time, and optimal backup time. Say your site collection was messed up during the day on Tuesday. You could state the earliest backup time as close of business Monday (e.g., 6 PM), the latest backup time as open of business on Tuesday (e.g., 6 AM), and the optimal backup time as Tuesday at 4 AM. The support team will get you the best backup based on this information. You should have at least 12 hours between the earliest and latest times.
- The restoration is done to a site collection. The entire site collection will be replaced and any changes made after the backup time will be lost (must be re-done after the restore).
- Once a restore is requested, it may take 2 or more days for the restore to be performed. This is done based on O365 support’s triage process and the perceived priority of the request. The tenant license or overall number of users for the tenant does not change the priority.