The table below describes what can be restored from Google Apps when items are accidentally deleted.
Google Apps
Restore Limit and Process
Email
Users can restore email in Trash folder within 30 days.
ITS can restore email that has been permanently deleted in the last 25 days if given a date range for the deleted email. All email deleted in the date range will be restored.
Users can restore files that are placed in the Trash by selecting the file or folder, and selecting “restore”.
ITS can restore files that were permanently deleted in the last 25 days if given a date range when the file was deleted. All items deleted during the date range will be restored.
Users can restore Contacts deleted within the past 30 days, by selecting the “More” button and “Restore Contacts”
Tasks
Users can restore Tasks deleted within the past 30 days, by selecting the Pop Up message “View Recently Deleted Items” which appears after you delete a Task. Select the curved arrow next to the deleted Tasks to undelete the Task. See: https://support.google.com/mail/answer/106237?hl=en