You will probably see the same as I got and as such am still stick at 2.0.3
The fresh image booted fine but after I applied the backup and rebooted I got
External config loader 1.0 is now starting…
Launching the init system... done.
Initializing............................. done.
Starting device manager (devd)...done.
Loading configuration......done.
Updating configuration...ERROR: Dangling Comment
Warning: rename(/cf/conf/rrd.tgz,/cf/conf/backup): Is a directory in /etc/inc/upgrade_config.inc on line 2660
Migrate RRD database lan-traffic.rrd to new format for IPv6.
Migrate RRD database lan-packets.rrd to new format for IPv6.
Migrate RRD database ipsec-traffic.rrd to new format for IPv6.
Migrate RRD database ipsec-packets.rrd to new format for IPv6.
Generating RRD graphs...ERROR: Dangling Comment
done.
pid 558 (rrdtool), uid 0 inumber 6015 on /var: filesystem full
/var: write failed, filesystem is full
pid 562 (php), uid 0 inumber 3997 on /var: filesystem full
/var: write failed, filesystem is full