Default [Q] roms for zte mimosa mini & new recovery program

i have rooted my zte mimosa mini 857 , using kingo root program
it has no new recovery
i only have the original of my phone.
i have make a backup before as sugested here
i could not install recovery and i didn't want a full upgrade because i didn't want to risk.
1) can i make a new backup now to save my new rom?
2) can i install roms using the original recovery?
3)is there a new rom later than android 2.3.5?