> I still stand by my statement that literally not a single piece of software exists that does the same as dropbox in terms of stability,
That seems a bit odd, since 4 sentences previously you state that you are pretty unfamiliar with the space "I've heard of 5 of those, I know how to use 3 for storage".
Rackspace cloud files, as one of the things I haven't used from that list, is not even same thing as dropbox. I've researched software like dropbox when I deactivated it, I did not look into all possible file storage offers that may or may not work with 3rd party clients (such as duplicati, which doesn't have android client as far as I can tell).
Another often suggested option from comments here wuala did not work on my phone, it crashed instantly (not sure if it's fixed now). Spideroak was buggy iirc, I did try it but I'm not totally sure why I dropped it.
Also, both of those options are roughly 10 times more expensive than dropbox when you compare GB/$.
That seems a bit odd, since 4 sentences previously you state that you are pretty unfamiliar with the space "I've heard of 5 of those, I know how to use 3 for storage".