BackupBot is a simple bot that can backup and restore individual channels either manually, or automatically. Best part is that its 100% free!
There is currently only a free version available which allows you to backup up to 3 channels at a time, and it does not currently backup embeds. I will be adding those features at a later date, so join my support discord for announcements!
For commands, issues or suggestions, take a look at the github! - https://github.com/Dawwa1/BackupBot-public