Also, as I asked above (really displeased when my questions do not get answered), are you making backups to an external device?
Also, if it is a Mac Pro 1.1, the "highest" OS one could use with that machine was OS 10.7.5. I used to own such a Mac, and I do remember seeing some "hacks" about getting more recent ver5sions of the Mac OS to run on the machine, but they seemed "dubious", at best.