[conceptualclarity]

free storage :
4Shared 15 GB; one source says account deleted if no activity for 30 days
Google Drive 15GB
Copy 15GB increased with referrals, 5 GB more by downloading the desktop or mobile app
adrive.com 50 GB; 2GB Individual File Size Limit
datafilegrid.com 25GB; file size limit 250 MB; reserves right to terminate account without cause
MEGA 50GB; no file size limits
OziBox 100GB
SurDoc 100GB; 2 MB file size limit; view and annotate 30 documents per month; 10GB per referral
shared.com 100GB
files.com unlimited storage?
BuddyBackup unlimited storage?
Hostr unlimited storage; 20MB file limit upload 15 files per day for free
filecanyon.com unlimited storage; file size up to 200MB

(Statistics given apply only to free versions of their services)

Please tell about good and bad experiences with these and other free backup services. What is easy to use? What will be good for keeping current with the changes made in your data? Which options are light or heavy on your system?

Please correct any not current info above and give as much information as you can on restrictions such as file/folder size limits with various options.

Also very welcome are suggestions for the best software to automate these kinds of things.

And yes, I will be getting an external hard drive as well! Therefore I don't want to pay for this.