The MyServers plugin is awesome for keeping backups up to date, even if you don't use it's remote access features
Without any current backup, what you're going to have to do is assign every drive (except what's obviously a cache drive) to the array as a data drive.
If you only had 1 parity drive, 1 drive will come up as unmountable. If you had 2 drives, 2 will come up as unmountable
If you have more drives come up as unmountable than you had parity disks, then stop whatever you're doing and post your diagnostics.
Tools - New Config and then assign the drives accordingly
Your existing docker containers should come up as normally, but without the templates you won't be able to edit them (or reinstall them) until such time as you get around to recreating the paths / ports you've had assigned to them (The docker tab will basically give you most of the information you need to recreate)