Proper backup?

Hi there,

I really want to reinstall my dedicated server (Debian 7 to Debian 8) which has an annual ts3 license running on it, aswell as a full functioning server with 99+ channels, servergroups and what not.

Question is, how do I do it without any dataloss, let it be the lightsql or other files?
And how do I implement the backup onto the new distro? (Debian 8)


Thanks in advance for your help! :)

- Andy

Proper backup?