Andy is on FTTC so has a decent upstream rate.

Originally Posted By: andym
As long as the backups happen overnight then there shouldn't be any issues with my allowance being eaten up.

Its poorly documented by A&A but there is another tier of usage charging. 2am to 6am is tracked as "21CN Night Special" which is 1TB per unit instead of the regular night rate of 100GB per unit.

21CN daytime (09-18 M-F) 2GB
21CN evening (18-24 M-F) 100GB
21CN night (00-02) 100GB
21CN night special (02-06) 1TB
21CN night (06-09) 100GB
21CN weekend 100GB
21CN weekend night special (02-06) 1TB