Alternatives to Picasa/Photobucket/Flickr for non-safe images?

Hello

Im looking for a online photo backup service that’s free or almost free like the most popular ones out there (Picasa/Photobucket/etc.), but that also allows uploading PG18+ images(nothing illegal off course).
Its not just for a backup purpose ( can use encrypted archives for that and use services like Mediafire/Google Drive/ADrive/etc.), but also to keep my pictures accessible from my other computers without having to download and unzip the whole package.
I have no interests in sharing such photos, just to keep them for a private use.