I'm about to upgrade my 1.39.3 system but I think I should probably do a backup first 
What's the difference between Admin Tools > System Backup and Admin Tools > Admin Backup/Transfer? Which should I use if I want to backup *everything* DA?
My goal is to do a main backup and then do incremental backups until the system is up to date. Is that doable?

What's the difference between Admin Tools > System Backup and Admin Tools > Admin Backup/Transfer? Which should I use if I want to backup *everything* DA?
My goal is to do a main backup and then do incremental backups until the system is up to date. Is that doable?