Samsung Galaxy • Slow or full • 10–20 minutes
Back up your phone and photos — Samsung Galaxy
Check for a software update
Go to Settings, then Software update, then Download and install. If one is available, install it first.
Samsung Cloud
Settings, then Accounts and backup, then Back up data (under Samsung Cloud), choose what to back up, then Back up now.
Google backup too
Settings, then Accounts and backup, then Google Drive, then Back up data, turn it on. Samsung Cloud covers Samsung apps and settings; Google covers the rest, so use both.
Photos
Open Google Photos, tap your profile picture, then Photos settings, then Backup, turn on Backup (same 15 GB shared storage note). Or use Gallery sync with OneDrive if you prefer Microsoft's storage.
Check it worked
Settings, then Accounts and backup shows the last backup time for Samsung Cloud and Google.