Online storage is good feature to critical situation when system damage or hard disk crash at that point if you use online storage facility then your important file and backp is safe on net and you can download easly after setup new system and restore your all backup
For this

Download dropbox application (you can use any other application )
From net (search in google filehippo, and search dropbox in search section)
Then click on download latest version 
Its a link download dropbox via filehippo website
Http://filehippo.Com/download_dropbox/download/71faf5fffeebe33b5abb380b3bd6428c/
After download complete install this application
If you have dropbox account please login and if you don't please create account via click on sign up
After sign in, go dropbox setting =prefrence
In dropbox preference =go account tab= and set your default backup folder.
Now place all financial backup or imp backup in this folder and system take auto backup from this folder to net.
Your data is safe on net and you can easily download these file from any system