The fastest (and often cheapest, if not free) option is a Cloud Drive. Simply upload your files, photos, and anything else to OneDrive, Box, Dropbox, or Google Drive.
Cloud-based backups: whereas a Cloud Drive lets you upload files on a one-off basis, a backup service will regularly take a backup copy of your designated files.
If you prefer a drive you can hold in your hands, you can also copy your files to an external hard drive. You’ll have to buy a drive; once you have it, simply drag your Documents folder (or any other desired files & folders) over to the external drive.
Step 2 is to remove any connected applications, especially those that sync files to or from your device. Examples include:
Sign out of Cloud Drives such as OneDrive, Box, or Dropbox
Deauthorize iTunes, so that future purchases don’t continue to download to the device you’re recycling.
Select the Account menu, then Authorizations > Deauthorize This Computer.
Step 3 is to encrypt your data. Not all Windows devices support this; if yours does, we recommend it.