The app you're using isn't the one I'd normally use, but 'current pending sectors count' being >0 isn't good. It means that some sectors on the hard drive platter are deemed to be faulty and are pending data re-allocation to a reserve sector. In theory this should happen without the system skipping a beat, but in practice it often doesn't happen when it should, and if this drive was the one that a computer boots from, just one faulty sector could be enough to cause Windows not to start.
There's a couple of SMART attributes that use the word 'uncorrectable', but assuming that the attribute in warning state here refers to uncorrectable sector count, that means the procedure to re-allocate a faulty sector's contents has failed for some reason. So while 'pending' is bad, 'uncorrectable' is worse.
The 'UltraDMA CRC errors' one though is interesting, it normally indicates an issue with data in transit, and is a reasonably decent indicator of a faulty SATA cable, though whether that applies just as well to USB is another question, it could suggest a USB HDD enclosure problem. Are you getting any CRC errors for your internal drive(s) or just this one?
I wouldn't rely on this drive for anything personally, certainly not backup.