Ten? Across Lemmy, Kbin, Mastodon, Funkwhale and Bookwyrm. Some of them are just for bots/admin. I have one personal account I use on each service. They all have different names and avatars to cause confusion.
I have a Backblaze B2 account I use for other things, I recently created a new bucket on it and attached it as a drive using s3fs. Works fine as far as I can tell (I've not used it much - prefer to keep things locally and just back them up off-site, which is actually what I have my B2 account for), so you certainly can do this with an S3 (AWS) compatible service.
Connect was the first app I installed for Lemmy and I've seen no reason to try any others - it's amazing.
I was excited for Artemis (for Kbin, Lemmy support due to be added) but Connect is so good I've been using Lemmy much more, even though I hate the web UI, and the functionality of Connect is beating Artemis currently.
My dad commented that One Man And His Droid was supposed to be good, when we were in a shop (Woolworths?) looking at games. Mid-late 1980s. I finally played it a couple of years ago.
Try fedi.tips