At Event Temple we perform a secure whole-database backup daily. You can also export your own information as a CSV file to act as a personal backup. This can be done in the following side tabs of ET by following the same steps.
Contacts
Accounts
Bookings
Events
Groups
Tasks
To download this information:
Choose from the Side Tab the section you would like to gather the information from. E.g. Contacts
Remove any filters (unless you want to exclude certain information)
Click Export As> CSV
Choose to Export All Columns to download all the information and click OK
Repeat in any Tabs you would like to back up.