.bin/backup-and-update-system: ignore rsync error code 24

.bin/backup-and-update-system

@@ -14,7 +14,8 @@ do
 done
 
 # Do a backup.
-rsync -zaAP --numeric-ids --delete --relative \
+(
+    rsync -zaAP --numeric-ids --delete --relative \
         --rsync-path="/usr/bin/rsync --fake-super" \
         -e "ssh" --delete-excluded \
         --exclude "/home/kunsi/.cache/" \
@@ -35,5 +36,14 @@ rsync -zaAP --numeric-ids --delete --relative \
         --exclude "/home/kunsi/VirtualBox VMs/" \
         "/home/kunsi" "kunsi-t470@home.nas":backups/
 
+    # Exit code 24 means some files have vanished during rsync.
+    # I don't know why, but this is very common, apparently?
+    exitcode=$?
+    if [[ $exitcode != 0 ]] && [[ $exitcode != 24 ]]
+    then
+        exit 1
+    fi
+)
+
 # Do updates
 sudo pacman -Syu --noconfirm