I have installed ownCloud, provides similar functionality to dropbox but it’s all here and included with your ordinary account. I’ve set the file size limitations to a rather large 4.9 GB enabling sharing of full DVDs such as Linux distributions, etc. If this gets a lot of use I may need to resize some partitions.
There is much functionality beyond what I presently have enabled as I am still learning it. But if you need a particular capability please let me know and I will focus on that.