backup appreciation day instructions
This MR:
- adds server models to use when testing backups
- adds instructions on creating servers for testing database backups
- fixes disk requirements for testing packagecloud (16TB was way to high, and before May we used 2TB disks)
- few white space cleanups slipped in automatically, let me know if I should drop those.
@ahanselka you would be the best person to check and merge those :)