UPS recommendation for synology NAS

[aeronic]

I need to buy a UPS for a synology 423+
It is very low powered (50W or so) but I would like a USB compatible one.

I've had a look at APC and cyberpower but would appreciate recommendations.
I would like to spend ideally less than £80

 

[rangor gubbins]

I've got an Apc BE850G2-UK for my synology 720+
Works very well, and we have a lot of power cuts. Plus it's quiet.

I've also got a cyberpower CyberPower BR1000ELCD-UK in the office. It whines and just feels/looks cheap