How do I prevent the personal notes I add from getting erased with updates? I had added a bunch of helpful points and synced with AnkiHub multiple times. For some reason, the last update deleted everything I had added.
Hello,
I would be happy to help. 
Yes, it is the case that AnkiHub functions by writing to your card’s fields. That is, in essence, the intended design of AnkiHub on the whole and so this behavior is largely to be expected
There are a few options available to you, though. The first is that the Anki software periodically and automatically makes backups of your local collection, and you can always restore from one of these local backups: How to Restore From Backup
From there, you can also opt to protect specific fields. In this way you can make adjustments or edits and, by protecting that field, AnkiHub will not be able to alter any changes that you make(as the field is protected).
You might keep in mind, though, that this is a bit of a trade-off; by protecting a field you ensure that AnkiHub cannot alter any changes that you make to that field though at the same time it prevents AnkiHub from being able to write to that field at all. Because of this, you won’t be able to receive any updates to that field.
This tutorial can walk you through how to protect a field: How to manage protected fields
In general, it is most recommended to make edits to the Lecture Notes and Missed Questions fields, as those fields are there by design for personal use and adjustment and AnkiHub never makes any alterations to them. In this way you can avoid the inherent conflict between editing your local collection and AnkiHub being designed to also write to your local collection.
Please let me know if that answers your question, and if there’s anything else I can help with.
Thank you so much!! This was really helpful.
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