Hello,
To keep your personal annotations from being overwritten, you need to protect the fields where you add them. You have two main ways to do this:
1. On the AnkiHub Website (Protects a field for all cards)
This method protects a specific field across your entire deck. It’s best for fields like “Lecture Notes,” as that field does not typically receive updates from our team. We recommend making your personal annotations there.
You can find a guide on how to do this here: How to Manage Protected Fields
2. Within Anki (Protects a field for a single card)
This method protects a field on a specific card only. It is recommended for fields like “Extra,” which often receive updates. However, keep in mind that protecting this field will prevent you from receiving any future updates for that specific field on that card.
To do this, go to the Anki Browser, right-click on the desired card, select the “Protect Fields” option, choose the field you want to protect, and then click “OK.”
To get back your annotations you can restore from a backup: How to Restore from Backup
Let me know if this clears things up! 