I keep multiple dated backups made using a script shell + crontab, to automate the thing.

Several flash drives stored at different places. I update them either once every three months or when I make an incredibly important change to one of the entries in the database.

I sync it using my pCloud folder. In case I’m away and I need access to them, I also have a cron job that copies the most recent version to a webserver I have, under a directory I only know of, protected by a password. My .kbdx files also need a credentials file that can be generated programatically. Secure enough for me.

I manually copy it to my phone, a thumb drive, a cloud service and another computer whenever I change something. I also let the filename show on which device and on what date the files was last modified. Example: Passwords_MY-SMARTPHONE_260314.kdbx

When I was still using it I used Syncthing to distribute copies to multiple devices and that distributed nature also functioned as a backup.

I copy it to external hard drives. It also syncs to other devices via Syncthing and Syncthing-Fork.

Yunohost + Nextcloud

Syncthing folder for the databases. Keep an additional key file on a separate storage and memorize a long password.

I manually copy it to Proton Drive and access it via android with KeepassDX

Webdav (of my mail provider)

I have mine on a nas server synced with nextcloud.

I backup the file to a separate ssd on a different machine every few days and then backup on a USB in a fire wallet every few months.

Syncthing.

I also will make a copy on a usb drive if I’m traveling and keep it in my luggage. Lesson I learned when I broke my phone during a recent trip and didn’t have any way to add a new device to syncthing to retrieve my keepass database. Which was a real pain in the ass.

Syncthing between my phone, my server, my laptop, and a cloud backup. Home server is always on so it “remembers” the sync to propagate to devices that were not turned on or connected to the internet when the change was made, cloud backup in case of catastrophe

Syncthing. It’s not so much a backup as redundancy, though.

I have machines in the network that rarely get powered on, however, so I could possibly consider them offline backups.

I am shocked how many ppl think synchronization like syncthing act as a backup.

No synchronisation is not a backup. If you accidentally delete the database and it syncs across all devices then the database is gone. If something is broken and overrides multiple times then the history if it is enabled is also gone.

Pls use proper backup methods to backup your database.

Edit: I sync my database also with syncthing across devices. But to back it up i have on multiple clients system backups running that include the database.