Finally today I backed everything from my 1TB external hard drive, which is NTFS. I'm going to reformat it. However, before formatting it to any filesystem, I would like to know what filesystem linuxers use for external hard disk.
I don't care about using it with Windows or Mac, as I made my PC Linux-only, and it's unlikely that I'll ever use Windows again unless on someone else's PC.
All I care about is that it should be reliable. I just store important stuff on it, so don't want to lose them. Also, my hard disk should last long.
Thanks for your replies!