Happy New Year Peter
This is what the links say
They tell you how to change space used
The minimum requirements
They also say that if you have the minimum space after enough time goes by you will begin to lose points
Points take up space. Make enough and you will begin to lose the oldest to make room for the new
You have to decide how far back you want to go with the points. If you want to go back, lets say 3 months and points begin to delete at 2 months you have to increase the space.
AT most you need 8 weeks worth of points and even that my be overkill.
Make 8 weeks
Download and use macrium reflect, which makes a copy of the entire hard drive for a big emergency. http://www.macrium.com/reflectfree.asp