Edit: I was able to recover my partitions by creating new partition starting and ending with same exact sectors.
I was copying files from my previous installation to my new Gentoo installation. After I was done. I ran wipefs on /dev/nvme0n1 thinking it is my old nvme drive which is connected through usb. I am in disbelief. Lost all of my configuration files. My perfect installation of gentoo. Just gone. How do I never make such mistake again? Thankfully I had backup of passwords file. Rest is gone. I am sad.
I usually physically take drives out and boot without them before wiping. Just something I do now, because of this exact situation.
Personally, I configure my entire os before signing in to websites or any software (or putting any privacy critical info on my system) then I backup my os to my NAS using rescuezilla, using linux its usually max 30Gb. I also have a private github repo that i backup my dotfiles to just in case my NAS kicks the bucket. Going back to a “clean” install after doing something stupid kinda sucks but at least all your hard work making it look and feel the way you want will persist. I also highly reccomend doing some sort of offline & off network backup for privacy sensative information. Best of luck, I feel your pain I nuked my system once after days of work and i said, never again.
I use gnu stow and my self hosted got forge to manage and back up my config files. With a 3-2-1 backup strategy on the gitforge of three copies, at least two mediums, with one offsite.
only thing that helps is more frequent backups. new backup before you wipe or change anything.
Perhaps try git for your configuration?
I haven’t done it yet, but I thought about trying to restore it on another PC and see if it starts.
Guys, I managed to recover my partitions. I used test disk to write the detected efi partition which was of 500MiB. The gpt partition table backup uses 33 sectors to I created second partition starting from where the previous ended to totalsectors-33. I was able to luksDump the header after this and successfully decrypt and mount my device. I had to grub-install and now my system is up and running. Thank you so much everyone for their help and their kind words.