any backup apps that can backup to NTFS file storage?

[Austinsevo]

or do all of them need HFS+?

[benwiggy]

OS X can only read to NTFS, though ther is some third-party support for writing.
You may be able to backup to other disk formats, though.

[trevor]

Is the "NTFS file storage" on the network, or connected locally to the computer that is being backed up? If it is shared on the network (and locally connected to a computer that can read and write to it, i.e. a Windows box), then it doesn't really matter if it's NTFS or any other file system.

Trevor

[hayne]

Except that TimeMachine (as far as I know) can only backup to an HFS+ filesystem.
Other backup apps might work - especially if they backup to an opaque blob (rather than to a folder of individual OS X files)