Léonie,
Yes, I keep multiple backups; thanks :-)
I have 3.6; I just need to be eagle-eyed in making sure a (Yosemite) update doesn't slip in which scuppers Aperture.
Also watching for better Photos.
Frankly, I use the effects and photo editing less than the filing, metadata and hierarchical organization of my precious images.
I took a quick look at Capture One Pro 8.
It seems good.
Is it really going places, able to work as well as we have become used to with Aperture… I always arrange, pre-categories and geotag etc on my hard drive; then do mitigate/keyword-rich imports using Aperture presets.
Can Capture One Pro do that too… 'capturing' suggests an emphasis on camera import?