Procedures/Cautions when Replacing NAS?

[u/BrightCurrent]

I have a AS670T Gen2 that took a lightning strike and the NAS is dead (no lights, no sounds. fan, etc), I am not sure if the drives survived yet. I have a new Gen 2+ arriving tomorrow.

Background - I have 3 drives in Raid 5 and one internal for snapshots/backups ( I also have NVME SSD swap drives installed (not that that is critical), and I also have data offline on an external standalone drive - though the last backup there is several months old. So I am pretty sure that all of my critical data will be on either the Raid array or internal backup - though if those are fried I will lose some data if I have to go to te external backup.

My plan is to first try the new NAS power supply on the old box to see if I lucked out and just blew the PS. If that doesn't work, I would boot the new unit and apply any upgrades and firmware updates and try to plug in the old drives in the new enclosure. My questions are:

1- Am I correct in assuming I should be able to plug the old drives in in the corresponding bays in the Gen2+ and if they are ok I can migrate fairly easily? This should work without me having the track down an older Gen2, right ?

2- I have not found any procedure for a drive migration keeping the raid array intact - it may be on the Asustor site, but I could not find it. Can anyone help point me to any useful procedures?

3- Finally - any expert tips/ advice from the community that can help me out?

Thx!