The most reliable, in my opinion, is to use an external hard drive to back up everything you have. You can do it weekly, monthly, or whenever you want, with no worries!
very first thing is to use external hard disks or write all the data on some CD/DVDs. Send all the data attached with email or take print out of same data.
the most back up solution its to protected us... while going somewhere we should aware of the fact the at any time anything can happen to that individuals... so as per my knowledge is concern the best back up solution is to protect our self by known one else just we can protect us