Verdict: Partly
Partly. Proton Drive lists desktop apps for Windows and macOS only, so there is no Linux app with folders in your file manager, but the web version works fine in a Linux browser.
Proton's download page for Drive offers a Windows app, a macOS app, mobile apps and the web version. For Linux it lists a command line tool rather than a desktop app, and a command line tool is not something a home user should have to think about.
So on Linux, Proton Drive is a website. Sign in in Firefox or Chrome and you can browse folders, upload, download, share links and use the photo section. Your files are all there and they download unchanged. What you lose is the convenience of a synced folder that updates by itself.
That difference matters more than it sounds if you were using Proton Drive as an automatic backup of your documents folder. On Linux that automation is not there, so you would need to remember to upload, or use one of the alternatives below alongside it.
Keep your Proton recovery phrase or recovery file somewhere other than the computer you are wiping. Proton encrypts your files so that it cannot read them, which also means it cannot let you back in if you lose your credentials.
Gives you back a folder on the desktop that syncs by itself, with the option of an encrypted folder for private files.
Your files: No Proton import. Download your files from the Proton Drive website once and upload them.
Keeps folders matched between your own computers and phone with nothing stored by a company. Encrypted in transit, but no online copy.
Your files: Works on ordinary folders. No Proton connection.
Worth pairing with the Proton website if what you wanted was a backup. Copies your files to an external drive on a schedule.
Your files: Backs up local files. Does not talk to Proton Drive.
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