Won't backup to NAS?

Warning: Complete Linux noob here. Please talk to me like I'm an idiot.

Just installed Linux Mint 4 days ago. Been trying to get some sort of backup program set up to backup important files to a NAS, but I can't seem to figure it out. I'm assuming it's all "user error".

My system: Linux Mint 16, 64 bit, Cinnamon.
My NAS: Synology DS213j (has a Linux-derived "DSM v. 5.0" OS). It's on my LAN (ie. not accessed via Internet).

I've managed to "mount" the NAS target folder in question (manually) on my machine, I can manipulate content in Nemo (Mint file manager). The Nemo location bar says "smb://diskstation/home/"

I've set up Backintime, but I strongly suspect I've not done it right. In the GUI setup, I've browsed to the target folder and selected that. In the "where to save snapshots" section it ends up saying: "/run/user/1000/gvfs/smb-share:server=diskstation,share=home".

When I click the "Take a snapshot" button it starts, it sets up a "backintime" folder (and several subfolders) on the NAS, but they all end up empty (no files are actually backed up, it just creates the folder structure, /diskstation/home/backintime/PCNAME/USERNAME/1). So BIT accesses the NAS to some degree at least. I end up getting the message "no backup needed". Repeating the process results in the folder being "modified" (date stamp updates), but no content is actually moved at any point.

Restarting BIT immediately throws me into the setup again, I have to tell it where to save the snapshot. Using the terminal command "backintime --snapshots-list-path" gives me "the application is not configured !"

What am I doing wrong? Please let me know if there's any relevant info I didn't include.

Btw, according to the NAS documentation, I can access the NAS via SSH, but only as "admin" or "root" and only on port 22, so I'd rather not use that option if possible (I have a knack for messing up important files and prefer to merely be a "user").