Transfer everything from old computer to new computer with Windows 11
Transfer programs and files to new computer
Transfer files from one computer to another
Transfer Microsoft Office to new computer
Restore programs and files from a broken or dead computer
Transfer directly from an old hard drive
Transfer to new computer using a USB hard drive
Corporate Windows 11 migration
User Profile Migration to new PC / new domain
How To Migrate Local Profiles to Azure AD
Migration to Server 2019 / 2016
Transfer everything from old computer to new computer with Windows 11
Transfer programs and files to new computer
Transfer files from one computer to another
Transfer Microsoft Office to new computer
Restore programs and files from a broken or dead computer
Transfer directly from an old hard drive
Transfer to new computer using a USB hard drive
Corporate Windows 11 migration
User Profile Migration to new PC / new domain
How To Migrate Local Profiles to Azure AD
Migration to Server 2019 / 2016
Transfer programs and files to new computer
Transfer files from one computer to another
Transfer Microsoft Office to new computer
Restore programs and files from a broken or dead computer
Transfer directly from an old hard drive
Transfer to new computer using a USB hard drive
Move To New PC - Compare Options
Migration Kit Pro - Advanced Transfer
Transfer programs and files to new computer
Transfer files from one computer to another
Transfer Microsoft Office to new computer
Restore programs and files from a broken or dead computer
Transfer directly from an old hard drive
Transfer to new computer using a USB hard drive

Short answer: it depends on the upgrade. Some Windows upgrades keep everything, some quietly keep only your files – and some wipe the slate clean. Here is exactly what happens in each case, and how to make sure you lose nothing either way.
A standard in-place upgrade from Windows 10 to Windows 11 (via Windows Update or the Installation Assistant, choosing “Keep personal files and apps”) normally keeps your programs, settings and files. The upgrade can still fail mid-way or refuse that option – which is why a backup first is not optional.
That’s it – the answer to “will I lose everything?” becomes a simple “no”, whichever upgrade you’re doing.