[Q] using adb backup n 2012 to n 2013, want to ensure I backup chrome bookmarks topic

I got a n 2013, moving from a n 2012. I never rooted the 12 but rooted the 13. Anyway, I'm using adb backup because it sounds like it's my only real option when not rooted.

I'm using adb backup -apk -shared -all -nosystem -f backup.bin

I read -system is for system apps but I haven't found a guide that is clear on what that actually means. Is it system apps only or system apps and data. Since I'm migrating to a new device I thought shouldn't use -system, but now that it's running, I'm thinking this backup won't contain chrome's bookmarks, or am I wrong?