P: Missing Pictures, Presets, and Watermark Data after 5.4 Update

No, it wasn't. But failure to sync was the cause of not being able to recover. Anybody using any kind of data generating software should know that backups are MANDATORY and that software error is INEVITABLE and that the only insurance is BACKING UP.

And how come that Lightroom cant at least name my presets that are gone?

Laguna paron preset is one of the most frequent used by me (not that one above) any idea how to find it again?

No. Not syncing is not the cause of the data loss.

Hello Daniel Lee, hello Peter Obermeier,

Thank you for your explanations.

I do not have LR Desktop. I only use LR mobile (Premium) on the Ipad and iPhone. Primarily on the iPad (Pro 12,9). 
On both devices a backup of the LR Cloud (or the local library) is not possible.
If I look at your explanations, I can even understand that. 
So it is clear: An additional (external) backup is only possible via LR Desktop. For this I would have to change my subscription. I would have to think about that.

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How were you able to find an old backup if the phone is doing the backup everyday? Mine is doing a back up every day 😕😕

Hello. I lost my pictures like everyone else. I was furious, very angry, but thanks to my iCloud backup and because I didn't have automatic app updates turned on and because I hadn't backed up to iCloud after the app update (it's done every night), I was able to restore EVERYTHING. I'm not going to upgrade again in a few years.

Gents.
Now that all my presets are gone I need your help. I have attached an image that I did just a day before all was gone. This photo had my favorite preset (found in the discover tab). Are there any ways to find out which one this is? Can I copy all the edits made by this preset to be able to save it and use it again?

I have around 400 photos with this preset and Im almost crying now.

It’s a bug in 5.4.0 in iOS version of Lightroom, you can update to 5.4.1 and restore the images from your cloud sync if you have a subscription. Or restore it from an iCloud backup if you have a recent backup before this happened. Or if you have the same somewhere else like a pc you can reimport them manually.

Peter, album structure should be stored in your catalogue, so back up the catalogue too. Presets are XMP files and are stored in different places depending upon your os and Lightroom version, you’ll have to look up where it is, you can include these in your backups, I don’t use presets personally.