We offer timezone support for your account and for conrtab type backup schedules.
You can your account timezone under Settings >> Profile. This timezone will be used to display any dates related to backups, account changes and logs.
When creating a crontab type backup schedule you can select timezone. Your backup schedule will run according to selected timezone. Changing your account profile timezone won't affect any schedule timezone. Please note If you created any crontab type schedule before 9th-July-2017 then it's likely running on UTC time.