Hello, sorry to hear you lost charts! Actually 1Chart already supports iCloud backup. So assuming your iPad has been backed up, you should be able to choose "restore from backup" after a reset. And then you'd have your charts back.
If you choose to "set up as new iPad" after the reset, you will not get charts back.
I sent more detailed info in reply to your support email — please let me know if there's anything else I can do to help sort things out!