What filesystem is currently best for a single nvme drive with regard to performance read/write as well as stability/no file loss? ext4 seems very old, btrfs is used by RHEL, ZFS seems to be quite good… what do people tend to use nowadays? What is an arch users go-to filesystem?
Ext4 is old, but fast and very robust. You won’t loose data or corrupt the filesystem if your system looses power. It can even survive partial wipes, if you accidentally overwrite the first few megs of you drive with a messed up dd, nearly all your data will be recoverable, including filenames and directory structure.
It doesn’t have very fancy features, but it is the best tested and most robust option available. (also the fastest due to its simplicity)
Btrfs has things like copy on write files that can protect you from an accidental rm, but this won’t save you from drive failures, so you still need backups for important data.
Some secondary storage devices ignore standards and outright lie about sectors being successfully written when they are actually scheduled to be written out of order. This causes obvious problems when power failure prevents the true writes from completing.