thank you guys!
feel silly I was not able to find that post.
My fears are sparkling from a QVX where I am storing some stock data and in almost a month time reached already 1.300.000 KB.
But according to all this info, we are good to go for the next two years ..should be no more than 35GB after this point of time!
In my opinion it´s not about how big a QVD can be, but what is the optimal size that can be managed.
There´s some aspects like
1) Time to backup
2) Incremental load can be slower (ex.: a 10Gb QVD, need 10G of reading and plus 10Gb of writing)
Generally I recomend that no QVD exceed 100Mb, so big tables are splitted using a date