save Diary ONLINE, not on local crashable hard drives & to access data anywhere

Why put all important stuff in this Diary, just to be at risk of losing all? My 4 internal & external hard drives have failed 4 times now on me, heartbreaking each time with all data loss of years of my life on them, all to now insist I MUST have every single thing ONLINE where the few things I have recovered are because of being somewhere on the internet. Access to all these important things online anywhere at work, home, or travel would be a must as well... like an account that's private & not indexed.