Backup:
ts3server.sqlitedb
licensekey.dat
serverkey.dat
(server.ini) ?? i cant found it at beta17 linux
,overwrite all files with beta18 and then:
play the 3 backup files into server folder and overwrite the 3 Files.
set chmod 777: ts3server.sqlitedb
(else the server cant write inside the database lol)
start the server