Also add Eeschema backup files to .gitignore.

.gitignore

@@ -1 +1,6 @@
 .DS_Store
+**/*.bak
+**/*.sch-bak
+**/*.kicad_pcb-bak
+**/*.tmp
+

hardware/pcb/mlb/Macintosh SE30 Main Logic Board.sch-bak

@@ -1,70 +0,0 @@
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr USLedger 17000 11000
-encoding utf-8
-Sheet 1 10
-Title "Macintosh SE30 Main Logic Board"
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Sheet
-S 1050 900  2800 2050
-U 5EC6E0CC
-F0 "CPU&FPU" 50
-F1 "CPU+FPU.sch" 50
-$EndSheet
-$Sheet
-S 4250 900  2800 2050
-U 5EC6E148
-F0 "ROM & RAM Muxes" 50
-F1 "ROM+RAM Muxes.sch" 50
-$EndSheet
-$Sheet
-S 7450 900  2800 2050
-U 5EC6E1BF
-F0 "GLUE & RAM SIMMs" 50
-F1 "GLUE+RAM SIMMs.sch" 50
-$EndSheet
-$Sheet
-S 10700 900  2800 2050
-U 5EC6E211
-F0 "VIA1, VIA2, RTC & ADB" 50
-F1 "VIA1+VIA2+RTC+ADB.sch" 50
-$EndSheet
-$Sheet
-S 1050 3600 2800 2050
-U 5EC6E28B
-F0 "Video Interface" 50
-F1 "Video Interface.sch" 50
-$EndSheet
-$Sheet
-S 4250 3600 2800 2050
-U 5EC6E34D
-F0 "SWIM & SCSI Interface" 50
-F1 "SWIM+SCSI Interface.sch" 50
-$EndSheet
-$Sheet
-S 7450 3600 2800 2050
-U 5EC6E3D0
-F0 "Serial Interface & Sound Interface" 50
-F1 "Serial Interface + Sound Interface.sch" 50
-$EndSheet
-$Sheet
-S 10700 3550 2800 2050
-U 5EC6E43E
-F0 "Power Connector, Pullups & Pulldowns" 50
-F1 "Power Connector + Pullups + Pulldowns.sch" 50
-$EndSheet
-$Sheet
-S 1000 6200 2800 2050
-U 5EC6E4FC
-F0 "Unknown" 50
-F1 "Unknown.sch" 50
-$EndSheet
-$EndSCHEMATC

hardware/pcb/mlb/Unknown.sch-bak

@@ -1,18 +0,0 @@
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr USLedger 17000 11000
-encoding utf-8
-Sheet 10 10
-Title "Unknown"
-Date "2020-05-18"
-Rev "1"
-Comp "Recreation of Apple engineering drawing 050-0253-01"
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-Text Notes 5250 5400 0    197  ~ 0
-This page is referenced in the other drawings, \nbut its contents are unknown. It was possibly a \n“bed of nails” flying probe schematic.
-$EndSCHEMATC