Keeping player data

[Eyeball114]

I have so many corrupted chunks in my server from losing power that almost every hour someone chases a pig into one and crashes the server. My server is fairly new so Im considering a reset to avoid these issues in the future. Ive asked my server what they thought and most are down for it if I can save player data/inventory.

Could someone please tell me what files inside the world folder I would need to keep and replace?

Quick layout is:

World Name

-data

-enderstorage

-players

-redstoneether

-region

-(dat)level

- level.dat_old

-(dat)railcraft

-session.lock

-(dat)uid

Ive never done this before so any help would be amazing appreciated. If it were up to me Id just start completely fresh but I don't want to screw the community I have in support of my server :/

[Djinnii]

Just keep the folder "Players" and "Data" to save players inventories, Alch bags and transmutation table progress.