Best way to transfer to new phone with iOS backup?

hi all, I have been using immich to back up my iOS photo library to my local storage. All assets came from the iOS app backup—was a lengthy initial sync.

I recently got a new phone and restored from an icloud backup. Immich stayed logged in and I was hopeful things would just keep working, but nothing new is being synced. When I try turning an album on to backup, it looks like it is starting to sync the entire library from scratch again. Is that necessary?

Thanks in advance.
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