Doing a backup of all your data is always a good idea. But even without doing manual backups, Marvin stores local copies of your data in the browser you are using or your File system when you are using the Desktop app, plus there is a copy of your data on our sync servers when sync is enabled.

To perform a backup, go to the account page through the menu at the top right:

At the top select "Backups":

Marvin will automatically select tasks and projects from all of your categories in the Master List. If you wish to backup tasks and projects only from some categories, you can first deselect all categories and then check the ones you want to backup.

You can also backup any settings you have and other data such as Smart Lists, Day Notes etc. by checking all the checkboxes at the bottom:

When everything is selected click the "Backup" button at the bottom to download all your data.

You might have to give permission to your browser to download the file.

See this guide for restore instructions.

If you'd like to save the backup file as JSON, just uncheck the "Compress backup" setting.