Making files undeletable, updatable only and unbackupable

Attributes on a file can help you control what people can do with different files you can make files
1: Undeletable (Even by root)
2: Updatable only (Even by root)
3: Unbackupable :) (Even by root)

1: to make a file undeletable type
chattr +i filename
even if root trys to delete the file they will not be allowed to, To make the file deletable again you will need to type
chattr -i filename

2: to make a file updateable only, which means that you will be able to append content to the file but you will not be allowed to delete it or remove content from it
type

chattr +a filename

3: to prevent a file from being backed up by admins using the dump command

type

chattr +d filename
to list the set attributes of a file type
lsattr filename