UPS battery backups are designed for just ONE function. To allow you to safely shut-down your computer in case you experience a power event. SSD’s are especially easy to scramble when they experience sudden power loss. The 600va backup on this page will give most systems anywhere from 5-15 minutes depending on power draw. Basically this battery is designed simply to auto-shutdown your system safely while you’re still on battery power.  It is not designed to give you extended ‘working’ time. You want a Surge Protector with Battery Backup. These APC UPS models also monitor voltage and will take over at highs/lows.

The 1500va version pictured could give the typical user 1 hour or more of power (3D graphics cards and games provide the shortest time). If you experience brown-outs and/or black-outs that last less than 30 minutes this backup would allow you to never stop working. So the choice depends on your needs and budget. At the bare minimum you should have power-loss protection but if you can afford it you should purchase the 1500va (or at least a 1000va) option that will actually give you working ‘time’. The longer battery life could be used to complete a task before shutting down or completely work through brief power outages.