Well obv i'd play there 
This depends on version and mod we wanna run. If your server is 'vanilla' 1.7.x and we make an FTB one, importing this "old" world will cause problems because FTB (At least ultimate) is MC 1.4.7, which means it can't import any block that is on the newer releases. (In this case, 1.7.x -> a lot of blocks that wont be imported).
From EA thread:

(24-03-2015, 06:36 PM)Mimus Wrote: Guess we would remove it and start a new one, since we can take the space of the current server -> no extra money needed. however, maybe lig can save the map or sth? i dunno. ill ask him in case u ppl want to have the map or sth
This depends on version and mod we wanna run. If your server is 'vanilla' 1.7.x and we make an FTB one, importing this "old" world will cause problems because FTB (At least ultimate) is MC 1.4.7, which means it can't import any block that is on the newer releases. (In this case, 1.7.x -> a lot of blocks that wont be imported).
From EA thread:
Mystik Wrote:So i suppose in this case "Vanilla" would mean some of the APIs? Obsolete Bukkit build? Spigot?




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