My Macbook Pro Mid-2012 has been running horribly slow for a while now. Constant beachballs and loading and switching apps is really slow. I got on Disk Utility and did the "Repair Disk Permissions". I also clicked on "Repair Disk". It asked me to restart my computer and hold Command-R to open Disk Utility and run the repair disk from there. I did that and it ran for a while and then said it couldn't complete the repair and to backup all files and reformat. This is a work computer, so I have to make sure I do things carefully. I do have a time machine backup, but I can't find in the Time Machine settings whether it's backing up just files or system files as well. If I went through the reformat process, what steps can I expect to get back up and running again? Will all my computer and software settings carry over? Will I have to type in serial numbers again for all my software? Anything else? Thanks for any info!