It allows you to upload PDF or website snapshots, and by default an account is granted 300 MB free storage. They also have paid upgrades:

2 GB: $20/yr 6 GB: $60/yr Unlimited: $120/yr

I've had the paid 2 GB plan for a while, I've got about 800 MB stored with them, and I've been very happy with the service.

Between the Firefox connector, the automated PDF OCR metadata lookup, and the ability to pull in metadata from DOIs, Zotero makes indexing things insanely easy. It's like MusicBrainz for articles. I'm always surprised how many obscure PDFs it correctly recognizes and indexes for me.

Personally, I just sync metadata and use my institutional Google Cloud storage for PDFs. A little more convoluted (I think this wouldn't work without the ZotFile plugin) but it appears to work across my 2 devices.

You can store pdfs and other article files, and sync them across devices. The first 300MB are free, and there are 2GB, 6GB, and unlimited-storage paying tiers.

Actually you can couple it to any WebDAV compatible cloud system. You can connect it to your own Nextcloud instance and have the limitations be your hardware.

You can also just set up a WebDAV server and sync that across devices. Works pretty damn well.

Huh, that's interesting! Do you know of a blog post where this is spelled out?

I use my Nextcloud install (since it provides a WebDAV interface).

In the options under the Sync tab, I select WebDAV as the File Syncing type and for the URL I put:

    my.nextcloud.server.com/remote.php/webdav

with the appropriate credentials.

Works flawlessly.

Thanks a lot :)

I set it up to sync the full-texts via syncthing, has been working flawlessly.