MySQL or Postgres instead of sqlite?

I am using urbackup since quite a while now and its internal database is growing like hell.

Since I have a big database host in my lab, I was wondering if there is a way to use one of those databases as a backend for urbackup?

No, but why would you need to? SQLite supports a database size of up to 281 terabytes, much larger than most filesystems or budgets allow.

For the easy reason of external databases. I can have the database on my central database server. Easier management / backup

Hi, I m also interested