[Task] Add support to specify backup folders

[314pies]

Task description

Right now, our built-in backup feature only backup the /opt/minecloud/server folder. However, since some games might have different files locations, it will be essential to provide support to backup other folders as well.

Note:

• This is the server backup script
• While passing in folder list to the script, pay attention to the EoL(End on Line) character issue between Linux and Windows.

Test

Make sure the feature is working with manual testing.

Document

Update Readme/Wiki if needed.

[314pies]

Done in version 1.2.2