additional hard drive - su can only write

Hello...


I have a hard drive setup:
http://picpaste.com/634aed03658d4e37...9c7b2f4df0.png

detail:
http://picpaste.com/584294509255193d...52e5fc71ce.png

I would like sdb2 (/backup) to be used for an expanded owncloud setup.
However I can only write as root to that drive ( ie when copying and pasting files)

I have to assume I borked fstab, but since I never mess with I am unsure what I am doing and need expert advice:
here is a copy of what it currently is:


/dev/disk/by-id/ata-ST3000DM001-1CH166_Z1F3ZH4L-part1 swap swap defaults 0 0
/dev/disk/by-id/ata-KINGSTON_SV300S37A120G_50026B723B0177FC-part1 / ext4 acl,user_xattr 1 1
/dev/disk/by-id/ata-ST3000DM001-1CH166_Z1F3ZH4L-part2 /backup ext4 acl,user
/dev/disk/by-id/ata-KINGSTON_SV300S37A120G_50026B723B0177FC-part2 /home ext4 acl,user_xattr 1 2


I am pretty sure my problem is simple, not sure how to fix though...

Thank you for your time
qu1nn