According to
this link, you should have a couple of default shares that are accessible over SMB - "backup" and "media". You may be using one of these, then, or you may have some other shares defined.
Log into your NAS' web interface, and select Configure -> Browse to see what shares you have... see if any of these are familiar, and whether you want to use one for your recordings. Remember that these are the 'root' shares, so you can have multiple directories below these (as you probably already have for TV shows, films, whatever). Create a new one if you need to, or just create a directory (e.g. "Recordings") in a suitable place if you want to re-use an exisiting one.
Now, the more fun bit is getting it mounted to your Chromebox. Have a read of
this page to see if it gets you started. Look at the [Mount] section...
1. The
what will need to point to the share you have defined on your NAS, as above
2. The
where will tell you where on the OpenELEC box you want it to appear (remember that, on Linux, remote machines are 'grafted' onto the directory structure and appear as local directories)
3. The
options are again dependent on your NAS setup - username and password as defined in the config
Assuming you create something like /storage/.config/system.d/storage-recordings.mount then, having defined this lot, you can test it from an ssh prompt with systemctl enable storage-recordings.mount. If it works, you can then cd to the directory you defined in
where and you should see the files on your NAS (or can create a file on your MacBook in the right NAS directory and it should be visible to the OE box in that location).
Making any sense?