@Sunflash I think a small amount is justified, but I have less fear hosting it on my own than letting dropbox or any other cloud platform house my data. Security through obscurity has some benefits! I tend to think that the more complex (amount of jobs) and less open-source a program is, the less secure. For example, Owncloud since it does contact, calendar, and file sync may be less secure than, say, Pydio which only does file sync but is open-source and pays for external audits. Pydio may be less secure than Syncthing which only syncs the files and has no web interface to view all of the files (it has one showing the status of machines and such). I know this isn't a perfect rule, but I tend to use it as a gauge. Others probably know a lot more about the security of servers, I think that just having a file server in the first place and using open source is a good step in the right direction.
To warn you, Owncloud may have a rocky road ahead (in my opinion) since a lot of their core developers recently left and forked it to Nextcloud, which is now being actively developed. I haven't really kept up with the divide, though.
