I switched external hard drives and lost all my data and posters

I recently switched from a 4tb to 8tb external hard drive. After transferring my movies over and selecting the new location I found all my posters and data are gone. No movies in my collections but the posters for collections is there. I thought the server would save that info. Is there a way to sync the old data to the new hard drive? Thanks in advance.

Typically you COPY everything from the original location to the new location - then add the new location path to the library.

Plex will - after some time to complete - ‘share’ the old metadata with the new metadata in it’s new location (because it’s all identical).

Only at that time, you can remove the old location path from the library. After a short time Plex will remove all the duplicates (you now can’t see 'cause Plex removed the Duplicates badge) - when things calm down you can remove the old files from their original location.

When you just Move stuff… it goes away and is added again as new.
Hardly anybody wants that. Unless you have very few items.

Which operating system/platform is your server running on?

Running out of my Mac mini M1

I am no Mac user, so I am not sure whether this is possible at all:
If you could somehow make the new drive look like the old drive. e.g. rename the old drive first, then give its old name to the new drive.
While doing so, Plex server must be not running!
Then restore a database backup of your server from back when the switchover hasn’t happened yet.

As far as I know, if you transfer your Storage Drive directory/ Content to a New drive with the same Folder structure, then remove the Old drive or rename it. Then Name the new drive exactly the same as the old drive was labeled. You should be good to go.

To change name of attached drive, Right Click, select info, change Name, close Info panel

Caveat: make sure the drives are formatted the same

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