I might be the only one who is COMPLETELY confused as to WHAT the Dynmap is.
I know that this may not work if the server is being run via an external host, but what if Ren or one of us just asked if someone would be willing to donate a spare hard drive/solid state drive that they might have. I know I know there are other things you would need to check, but just consider it an option.
I think if were getting rid of it the seed should be announced so we can look for biomes on websites such as chunkbase and such
I had to learn that seeds won't be make public - I wanted to search for slime chunks. Maybe there will be the option to just ask the mods if a chunk is a slime chunk... I hate to search for them manually. xD
What about if it's set to only update every day or so? That way it would save RAM and the only requirement would be to keep it up, which wouldn't be as hard on computer systems etc.