DB backups are made in realtime to a backup server, there a dump is created every 12 hours, compressed awaiting download or rsync.
A small home server connects once a day to the backup DB to sync everything and uses rsync to download modified or new files.
These modified files are kept in a directory so I've still the original installation, modified files of the last half year / one month / 1 up to 7 days in case I need them.
In a worst case backups are 12 hours old.
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