This is a post mostly for self-reference:
When you start a really long process (say, a backup) and forget to run it under a screen instance or using &, you can pause the process and resume it in the background with a couple of commands:
$ ./my_backup_script ^Z [1]+ Stopped ./my_backup_script $ bg 1 [1]+ ./my_backup_script & $ disown -r
Running disown is important, because it tells the process to continue running after you close your current session.
