It will be basically every file type, from pictures to music and movies. But it will be mostly pictures. I've been looking at: 1) Cloud services like OneDrive and Dropbox. These have well-developed apps for Windows and Android (what I use), but choosing the right cloud service seems like a mess and they are usually more expensive in the long run. 2) NAS-server. I like these a lot. But my concern is that the apps these companies use are almost useless. I read that WD app is slow and you can't for example pinch to zoom. And then there are tons of bugs. Also, NAS-servers tend to be slow unless you're ready to shell out some serious cash (which I am not willing to). 3) The third option is setting my own FTP server or something. My computers are always on and online, so this could be a cheaper alternative. But I have not set up FTP server for years and years. I don't know if there are any apps I can use to connect to my FTP server, but maybe someone can shed some light on this? 4) My router has USB 3.0. Connect an external HDD to it? Can it actually make the HDD visible online? 5) ???? Are there any other alternatives? In case of 2 and 3, raid 1 is not a must in the beginning but eventually, it will be required because mechanical HDDs tend to fail after a while.