tested

[Kojfer13]

Added a backup option

[arcmags]

I appreciate the contribution, but I'd like to see some changes before merging.

Firstly, all variables in a shell script should be properly quoted, so something like:

tar -cvf $name $srv

needs to be changed to:

tar -cvf "$name" "$srv"

Also the backup location is hardcoded to a root directory that may or may not exist and may or may not be writable:

bck="/backups"

This probably shouldn't be hardcoded to a root directory. Some checks need to be performed to see if it exists and is writable. A config option should exist in minecraftd.conf to set the backups location.