Hosting git repositories -- Gitolite allows you to setup git hosting on a central server, with very fine-grained access control and many (many!) more powerful features.

a tool for backing up your data using rsync (if you want to get help, use https://lists.sourceforge.net/lists/listinfo/rsnapshot-discuss)

Nginx Tutorials

Tool for creating snapshots and remote backups of btrfs subvolumes

support AJP protocol proxy with Nginx

SPORE specifications