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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Check out Vaultwarden. It is the Bitwarden, but made in Rust. It is lightweight and yes, it does run in docker. You can use bitwarden's apps and extentions with. You get all the enterprise edition features too.
Backing up the container data is very easy. Also, you can export the passwords in a json or csv file using the apps. If the server stops working, the passwords are still cached in the apps, and you can export them even if you are offline.
To share passwords, both accounts have to be on the same server. Or you can use the Bitwarden Send feature.
I have been self-hosting Vaultwarden for two years, and have corrupted my data once, because I updated the container very late, and it jumped multiple versions. No harm was done, as I backed up my passwords, using the app's cache.