I unfortunately kept all my backups as NTFS and I maintained that for a while because "legacy" and I was lazy. Converting them all is gonna take a while. So I'm sort of waiting until it's inevitable.
I have over 2TB's of data. While yes I can read them on linux, it it's always perfect and there are issues regarding permissions on occasion or an issue where it doesn't recognize the directory for some odd reason. No idea if it's a linux issue, the standard ntfs reader I have on my distro, or what. But, I figure if I'm going all out linux, might as well make it difficult to jump back out :)
2TB is not much at all. Tip from experience: Don't touch your important ntfs data with the linux drivers, instead get an ext/btrfs driver for windows. winbtrfs[1] is stable and works great for that purpose.