How to backup/restore your JD configuration
This can be helpful if you:
[Beginners] How to create a backup?
[Beginners] How to restore a backup?
[Advanced & Headless users] How to backup- and restore your JDownloader configuration via configuration folder backup (settings, accounts, downloadlist etc.)?
Alternative: How to backup your config even if JDownloader doesn't start at all e.g. due to a broken installation.
Manually
Inside your JDownloader install dir you can find a folder called cfg.
This folder contains your complete config so you can manually create a backup of it.
Automatically
You can of course use external backup applications to automatically create backups from said folder.
Examples of such applications:
Windows, Linux, Mac: FreeFileSync (link), Syncthing (link)
Linux: Resilio (link)
Restoring a cfg folder backup
Copy the previously stored cfg folder over to your new JDownloader installation.