Proton Drive Desktop Sync: What the Folder Mirror Does — and What It Is Not

What folder sync is actually for

Sync means: a file you save in a chosen folder on the laptop appears in Drive, then on the phone or another PC, without a manual upload. That is how Dropbox taught a generation to work. Proton Drive now has desktop clients that play that role with client-side encryption as Proton documents it. The job is convenience plus the host-not-reading-files story. The job is not disaster recovery.

If you overwrite a novel and walk away, version history (stronger on paid plans) may save you. If ransomware encrypts the synced folder while you are logged in, the cloud can receive encrypted junk. Those are different failures. People mix them up because both involve 'the cloud.'

From the record

Sync copies the present. Backup remembers the past. You usually need both, and they are allowed to be different products.

GUIDEORA desktop-cloud rule

What the Windows and Mac apps currently do

Proton documents desktop apps for Windows and macOS that sync files and can show a virtual drive so you are not forced to duplicate every byte locally. The web app's Computers area is where you inspect what the desktop client sent. Linux users should check Proton's current client list rather than assume feature-parity. Mobile remains the photo-backup story more than the heavy-folder story.

Exclude caches, node_modules, VM disks, and downloads dumps. Those paths waste quota and sync time. Include tax, contracts, and the project folders you actually open on two machines.

Why this is not a 3-2-1 backup

3-2-1 means three copies, two different media, one off-site. A synced Drive folder is usually one copy that happens to live in two places that stay identical. Delete locally (depending on settings) and you can delete remotely. That is the opposite of backup. Paid version history helps, within Proton's caps (Free: short window; paid: much longer — confirm in Settings).

A sane first-week setup

• Install the desktop app from Proton's site, not a random mirror.
• Sync one documents folder. Watch quota for three days.
• Turn on version history settings you want on paid plans.
• Keep a yearly zip of irreplaceable files on a disk that is usually unplugged.
• Sign out of the desktop client on a shared or repair-shop PC.

Use it as a private Dropbox analog

That is the honest product: Dropbox-like plumbing with Proton's encryption story. It is worth it if you already wanted that trust model. It is not a replacement for backups.