Not the one who wrote the command: The Keepass DB encryption is afaik pretty damn good. So that wouldn’t be an attack vector I would worry about. Also and those are just my five cents and I might probably be ripped in pieces by some it sec people, I wouldn’t fear too much about a backdoor being put into your systems when self hosting. If someone actually does this it’s most probably gonna be some actor related to a government that targets you for whatever reason and at least then most of us wouldn’t stand a chance to keep all of their IT devices save, especially when they could stop you on the streets and get physical access to some devices. On the other hand hosted services with thousands of customers are also a lucrative target for cyber crime and which you as a self hosting individual are most probably not. This reduces the possible threats quite a bit, at least if you keep up some default safety stuff to not just let any wannabe hacker from wherever into your self hosted services that would be happy if they can get a 5 thousands dollars/ euros or whatever from you.
How much storage did it use overall? I had one instancs running on a 40gb HDD VM and it ran out of disk space in like 2,5 months. From what I’ve seen it was a mixture of 66,6/33,3 postgres/ images and other media. Didn’t had the time to learn how to clean it up and prevent it from happening again after a month. All happens like may to August last year.