Every update check (the one which only checks if there is new update) takes aproximatelly 3-8 KB. This cannot be too much even for 56K modem. Update itself can be lass then 500KB !
That's certainly too much!
The update
check has close to nothing... I don't know... a few hundred of bytes I guess.
The real VPS update could have that 3-8kB... sometimes a little more, when the embedded Cleaner is updated or a lot of new detections is added (let's say 50kB). 500kB would be the update size for the program update, not the virus database.
In any case, the automatical updates can be turned off in the program settings.