Am I able to add Mystcraft to an already made server?

[Kaya]

I currently have a FTB Mindcrack server. A few of the players wanted to have the Mystcraft mod installed. First, am I allowed to add Mystcraft to a Mindcrack server? And secondly, if I am allowed to would it disrupt the current state of the server? As in would everything that has currently been put on the server be erased?

 

[lavarthan]

Edit: Be sure to backup just in case.

You should be able to. If you already have Twilight Forest installed then you can safely ignore the second part of this. The only mod I know of that may interact poorly with Mystcraft ages is Twilight Forest. The interaction is if you install Twilight Forest after Mystcraft. Twilight Forest chooses Age 7, iirc, as its default. So you would have to change the default in the config file to an age beyond what is in your save file.