Backups, synchronization and file sharing

Synchronization brings locations toward the same state; sharing grants access to another person. Understand where deletions and overwrites propagate, and consider a separate way to restore earlier data.

Before choosing a task

  1. Decide where to store data and who needs access, including whether cloud upload is necessary.
  2. Check deletion propagation for sync, and viewing/editing permissions and revocation for sharing.
  3. Open transferred files at the destination and test whether required documents remain available offline.

Compare the options

Comparisons · How the FIDO Alliance's Authenticator Certification Levels (L1, L1+, L2, L3, L3+) are evaluated, the per-OS and per-browser limits stated in Microsoft Entra ID's passkey (FIDO2) compatibility matrix, and how passkeys are handled in Windows

Choosing a FIDO2 security key: what the certification level means, and the combinations the OS already rules out

What have L1 and L2 on a security key's product page actually been assessed against, and who decides that NFC or BLE is unavailable on a given OS? Read from the FIDO Alliance and Microsoft. Before buying, the combination matters more than the key's own specification.

Read guide →

Choose an app

Follow the steps

How-to guides · The creation steps, stated scope and ordering of recovery options published in Microsoft Support, Recovery Drive and Recovery options in Windows (read 2026-09-21)

The recovery drive to make on day one: what it holds, what it does not, and which USB stick to use

A recovery drive contains no personal files, works on the device it was made for, and is recommended to be recreated every year. From Microsoft's own pages: what to know before making one, the one checkbox that matters, how it differs from Reset this PC, and what else you will need on the day the PC will not start.

Read guide →
How-to guides · The settings location, the start and stop steps, and the choices and warnings on stopping, as published in Microsoft Support, Back up your folders with OneDrive (read 2026-09-21)

Check which folders OneDrive is holding, and the two choices when you stop

Once Desktop and Documents come under OneDrive, both where files live and how free space looks change. Where to see which folders are covered, the difference between keeping files only in OneDrive and only on the PC, and the warning that appears when cloud-only files are in the way.

Read guide →
How-to guides · Google Drive

Use Google Drive files offline

Prepare Google Drive files for offline use. Select the Docs, Sheets or Slides files you need and test access without a connection before going offline.

Read guide →

Search all practical guides →