I am a big fan of stripe, recently using them for 57north's MakeIt-Glo workshop. The payment was smooth and easy to use, we didn't hear about any issues with stripe from any of the attendee's either.
Bitcoin I am still unsure of. I would love to make £1000's from idle speculation, but I haven't been able to buy it from anywhere other than people in the real world.
Being able to use both together can only be seen as a good thing, the more services that start to take bitcoin the better. Services like stripe that are genuinely legitimate and have good standing go a way to remove a lot of the alarmism around the currency.
Tarsnap is one of my favourite services on the internet. If you are looking for secure small scale off site backup I can't think of anything better.