If you are a Pro user, Covve will automatically backup your contacts every time you open the app. So you can request an export of your contacts from a previous date.
You can find daily backups in your Profile by tapping on the ... in the top right.
All you need to do is tap a date and you will receive an email with your contact list from that date.
Note: This is Pro feature, and backups start being taken from the point in time a user become Pro.