I recently reinstalled Ubuntu and upgraded to 15.04. I tried to restore from an earlier backup (using the default GUI software) but perplexingly, it didn't restore to my /home partition, but my root partition. Obviously that can't be good. It says there's "only 0 bytes left". I can't log in with the GUI now, only terminal works.
How do I:
a) revert the changes done to the root drive? Can I find a changelog showing what the backup did? I don't know the exact time I initiated the backup. I want everything done to undo with a minimum effort.
and
b) properly restore the files to the home directory, making sure I know how never to let this happen again?
I would REALLY prefer not to have to go through the reinstallation process once again. Thanks!