As last option if you not want install or pay any software you can use rsync
If you want use rsync, you may want to clone your entery server in a virtualbox machine or any orther virtual enviroment and have a working copy if you use correct configuration, that may works, not as special backup software but will work
Try it with your own risk you may need use -H -X --one-file-system --numeric-ids
I recomend you do it in side virtual machine and copy all you have and last pass with mysql server stoped.
But I strongly reocomend you use special software for that as acronis or veem