Quick answer
First make a full backup of the data from the old computer to an external drive, and only then move to the new one. Then transfer personal files, then accounts and applications, and finally verify that everything works before you erase or dispose of the old computer. Never transfer data without a backup that remains saved.
How to recognize the problem
- You bought a new computer, but all your files stayed on the old one
- You don't know which settings and accounts need to be set up again
- You're afraid you'll lose something during the transfer
- The old computer still works, but you don't want to risk data loss
- You're not sure whether the backup you made is complete
Most common causes
Data is scattered in multiple places
Files are often in Documents, on the Desktop, in Downloads, but also in cloud folders and in local application folders. If you only look at one folder, some data stays on the old computer.
Accounts and licenses don't transfer themselves
Email, browser, passwords and licensed programs are tied to an account or a device. That's why you need to sign in to the same account on the new computer or manually transfer the data.
No verified backup before the move
If you transfer data directly from disk to disk without a backup, an error during transfer can mean permanent loss. A backup on an external drive is a mandatory step, not an option.
The old computer is erased too soon
Erasing or formatting the old computer before you verify that the new one has all the data is often a cause of panic. Checking before erasing solves the problem.
Step-by-step fix
- 1
Make an inventory and a full backup from the old computer
Connect an external drive with enough space and copy everything you need: the
Documents,Pictures,Videos,Music,Downloadsfolders and the Desktop. Don't forget local application folders. If you have saved passwords in the browser, check that synchronization with your account is enabled; copying the browser profile can preserve bookmarks and settings, but saved passwords often won't work on another computer. If you do copy the profile, close the browser first. Leave the backup on the drive and don't delete it until you've verified the new computer. - 2
Note the accounts and programs you use
Make a short list: Microsoft 365 or Google account, email, cloud services, programs you paid for and their serial numbers. Also write down settings that matter to you, for example mapped network drives or the printer. That way you won't forget an important account on the new computer.
- 3
Transfer files to the new computer
On the new computer, connect the same external drive and copy the folders into the corresponding user folders. In Windows, the Documents folder is usually located at
C:\Users\<your name>\Documents. If you use OneDrive, you can let the files sync from the cloud, but first check that all files have actually been uploaded. Don't move files from the external drive, copy them, so the backup remains intact. - 4
Sign in to accounts and restore settings
Sign in to your Microsoft account or Google account and check that email, calendar and contacts are there. In the browser, sign in with the same account to restore bookmarks and passwords if synchronization was enabled. For programs you paid for, reinstall them and enter the license.
- 5
Verify that everything was transferred
Open a few important documents, photos and spreadsheets and make sure they open. Check that all folders from the old computer are present and whether there's a difference in the number of files. Only when you're sure everything is there can you think about erasing the old computer.
- 6
Set up a backup on the new computer too
Enable automatic saving in a cloud service or set up File History if you use Windows. This protects you from future problems, because transferring data is not the same as a backup. Verify that the backup actually contains the files you expect.
- 7
Securely remove data from the old computer
If you're giving away or selling the old computer, first make another backup verification, and only then erase the data. Resetting the computer while deleting personal files is an irreversible action and is not a guarantee that the data cannot be recovered, especially on an SSD. That's why before erasing, enable disk encryption or use a secure erasure tool. If you're not sure and the disk can be removed, it's better to remove it and keep it than to hand it over with data on it.
When the transfer doesn't go smoothly
If the old computer won't turn on or the disk makes reading errors, don't try to copy everything at once. First check whether the disk is visible at all and copy the most important folders individually. If error messages appear or the transfer is interrupted, stop and seek help, because further reading can worsen the condition. For businesses, the recommendation is to make a backup to a network drive or NAS before moving to a new computer and to verify it before erasing the old device. If you have multiple computers, agree in advance where shared files go, so that no one keeps a backup only on their own computer.
How to prevent it
- Make a backup to an external drive before any transfer
- Keep a list of accounts, licenses and programs you use
- Enable automatic cloud saving or File History on the new computer
- Don't erase data from the old computer until you've verified the new one
When to call a professional
If the old computer won't turn on, the disk makes errors or you have business data without a verified backup, it's better to contact IT support than to attempt recovery yourself.
IT infrastructure maintenance · Servers, networks, backup, security and helpdeskFAQ
Can I transfer all data with a single program?
You can use built-in transfer tools or cloud synchronization, but no tool transfers absolutely everything, for example passwords and settings of individual programs. That's why it's safer to manually check folders and accounts after the transfer.
What is most important to transfer first?
First documents, photos and other personal files, because they are the hardest to replace. Then accounts and programs. Settings and aesthetics can be sorted out later, but lost files cannot.
Can I erase data from the old computer immediately?
No. Wait until you've verified that the new computer has all the files and that they open. Only then can you erase the data. If you're giving away or selling the device, use secure erasure before deleting or remove the disk, because ordinary deletion is not a guarantee that data cannot be recovered.