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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nutbutter answered most of your questions, but yes the original BitWarden also runs in docker. I run my containers inside a VM that I snapshot weekly and keep several backups, so if anything gets corrupted I just restore a VM snapshot. Has never happened for any of my Linux VMs though, only to PFsense a couple times before I abandoned it.
But as nutbutter also mentioned in his great reply, even if you had no backups the client caches will save you.
Sharing costs a fee with Bitwarden, but I only use it for myself so had no real reason to try Vault Warden. That may help you decide which version to try.
Be aware that while it has an iOS client, iOS is REALLY picky about certs these days. It does not let me use certs signed by my internal OPNsense CA, which is really irritating. That’s Apples fault though.