Usually that involves exporting the database on the old server and importing it on the new server, and copying the entire Piwigo directory hierarchy to the new server, then adapt Piwigo's database configuration to the new database location and login. As you didn't say what you have done so far there's not much help possible. Anyway, there are dozens of threads about this topic a search would had revealed. See also https://piwigo.org/forum/viewtopic.php? … 07#p171407