I moved your posts to a new thread.
Thanks for the screenshots.
It appears you updated the NAS from DSM 6 to DSM 7 on 24 August (the date on the database files in the screenshot).
This is when your libraries disappeared, correct?
Your Plex server, as it existed on 24 Aug, is still there, in the /Plex shared folder.
It can be recovered if you wish.
However, your current Plex server will be deleted during the recovery process. It is not possible to merge servers. Any media files added since 24 Aug will be rediscovered, but any metadata edits, collections, etc. will be lost.
If you wish to recover the old server, see this post: Struggling with migration from DSM 6 to DSM7 - #2 by FordGuy61. It outlines the recovery process.
Read it over and write back with any questions.
