Hi F1gh3r,
Thanks for your reply.
I have checked on SRX550 and you are right the behaviour is the same as SRX345.
Regards to below process:
Formatting alternate root (/dev/da0s1a)...
Copying '/dev/da0s2a' to '/dev/da0s1a' .. (this may take a few minutes)
The following filesystems were archived: /dev/da0s2a' to '/dev/da0s1a,
I guess the current version resides on da0s2a storage and da0s1a is a backup partition. Both storages are compact flash?
Regards,