You can take a backup of your Library which will save all the publications, file attachments and comments that you took. To make a backup, click on the "Settings" button on the bottom right corner of colwiz Library and open the "Backup" tab. Click on the "Save Backup" button to backup your library.
To restore a saved backup, click on the "Restore" button. Keep in mind that logging in after restoring the backed up data will synchronize your data with the latest changes that you have done in your library. So any publication, file or comment that was present in the backed up data but was deleted will be deleted again automatically upon logging into the Library.