Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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It is a sync, it's exactly what is supposed to happen. In cloud computing there is sync and remote back up. Each behaves differently, there's also sync directionality, archival metadata, snapshots, etc. Always make sure you understand how the storage solution works before committing your files to someone else's custody. And as the old adage says, at least two independent mediums, at least two distant locations, at least one restore rehearsal a year, or else you don't actually have a back up.
It's the 3-2-1 rule. 3 backups in 2 different mediums with 1 off-site.