I'm looking for a file system for an external HDD which will be basically used for backups. It will only be used with Linux machines, so I don't mind having a Linux-specific file system. I may consider encrypting the drive, but it is not necessary since I don't mind encrypting sensitive files and directories manually.
I did some research on file systems like ext4, Btrfs and XFS and even found a benchmark, but I couldn't come to a conclusion.
Is there a significant difference between file systems supported by Linux which I should consider in this setup?