As the savedvariables is automatically saving the data you can use e.g. the additional "sub key" in the savedvars for the servername.
If you are using non-accountwide settings:
Be sure to switch from ZO_SAvedVars:New to ZO_SavedVarsNewCharacterId too so renames of characters are handled too. The savedvars will be saved with the id of the char and not the name any more!
Lua Code:
local savedVariables = ZO_SavedVars:NewCharacterId("KeyForTheVars", variableVersion, "ServerNameHere", DefaultValues)