New version tells you free space available on your backup volumes, as well as checking for errors occurring during backups.
free space
Should you defragment files, or free space, in El Capitan, or are they even possible now?
228.7 GB of my internal disk is occupied by ‘Other’. Where has this gone, and how can I reclaim it?
My hard disk is running out of space, and only has 104 GB left of its original 500. How come?
How can I strip OS X down to improve iMovie’s performance?
How much free disk space should I keep on two external hard drives, a 2 TB and a 250 GB?
The Eclectic Light Company 