I need to know how many data my server transfer over a month.I know from my control panel only my average Mbit/s daily that is:  26Mb/s.Doing some calc:26Mbit/s = 3.25 Mbyte/sDaily usage: 86400 (seconds) * 3.25 (Mbyte/s) = 280'800 Megabyte  Month usage: 30*280800 = 8'424'000 MegabyteSo each month my server transfer 8000 GB (8 TB). Is it correct?
Average of 26 Mbit/s how many GBs/month?
bandwidth
That's about right. Your monthly usage at 26Mb/s would be 8.541 terabytes.Wolfram Alpha is very useful for calculations like these. You simply type 26Mb/s for 1 month as the search term and get the following output:Input interpretation:26 Mb/s  (megabits per second)  1 monthResult6.83310^7 Mb  (megabits)Unit conversions68.33 Tb  (terabits)  6.83310^13 bits  8.541 TB  (terabytes)