At the moment I use an SRX220H [12.1X46-D65.4] and I would like to buy another one for backup/upgrade purpose. I do not need a high availability setup (cluster), so I think I will purchase an SRX220H2 (since the support for the SRX220H will end in a couple of years).
Are these devices perfectly compatible and do you think I will be able to export the configuration from the SRX220H and upload it to the SRX220H2 without any issue?
We don't use DPI, actually. It is quite a simple configuration with 5 to 6 Lan-to-Lan VPNs and a simple LAN to WAN Internet Access (with NAT). We have some published internal server (Port forwarding) and nothing more.
I suppose the interfaces name are the same between the 220H and 220H2 so the configuration should run smoothly after a copy/paste operation.
If you can accept smaller changes to the configuration (layer2 has changed to ELS-style config), then I would recommend looking at the SRX300 series instead. Better performance, built-in SFP ports and no fans... and a list price roughly 40% lower than the SRX220H2.
On top the SRX220H2 will not be upgraded further than the 12.3X48 software train where SRX300 series will run 15.1X49 and 17.x when it arrives.
All security policies, nat and VPN will be the same - you are just futureproofing your solution even more at at lower price :-)
The fact that the configuration will be the same is a huge relief to me because I will not have to deal with potential issues, but I will take a look at the SRX300 series for sure since it seems a very interesting one.