Hi,
If you’re searching for all the answers then have a look here: Topics tagged backups
In short the options which come to my mind and which you have:
- use Seedvault (it’s integrated into /e/OS but there are a lot of apps it won’t backup)
- use “Android Backup Project” (it works imho with more apps but still not with all)
- (temporarily) root your device and use a backup app like e.g. Titanium Backup (this might backup/restore most apps/data)