Missing files after backup

[Dsn1]

I was forced into a factory reset on my S20 Ultra, backed up everything on Samsung cloud, Google cloud and one drive then after restalling everything I noticed quite a few files are missing, Samsung notes is missing the last 4 years of data, calendar is completely wiped all downloads are gone. Any ideas what happened? 

[Ksmy89]

Unless you had sync toggled on for samsung notes and calendar under sync settings for your samsung account, they wouldn't have been backed up. Download files would have been on your device's storage so unless you physically moved a copy to an SD card or PC/hard drive, these also wouldn't have been backed up unfortunately.