TYhat's certainly not the best way! The best way is to avoid online storing at all cost. Generate a number of fresh addresses on a safe computer and divide your coins among them. Then dump the priv keys and write them down to a text file and to a piece of paper. Put the piece somewhere safe and do the same with the backup file, just remember to store them in 2 different places like one in your house somewhere and 1 outside, so that in case you had a fire or a hurricane only one of them will get damaged. Last but not least make a last will and put the location of the backups in it, so that if you die in an accident someone can benefit from your coins.