Cloud Backup

What technology do Cloud backups use to syncronise data.
Allan_FernandesAsked:
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Scott Fell, EE MVEConnect With a Mentor Developer & EE ModeratorCommented:
I'm not going to pretend I understand any of this. I seem to remember there was a write up on dropbox when it first started. All I could find is this

http://eranki.tumblr.com/post/27076431887/scaling-lessons-learned-at-dropbox-part-1

Python for virtually everything; not more than a couple thousand lines of C
MySQL
Paster/Pylons/Cheetah (web framework — minimal use beyond templating and handling form input)
S3/EC2 for storing and serving file blocks
memcached in front of the database and for handling inter-server coordination
ganglia for graphing, with drraw for custom graphs like the stack graph mentioned above
nginx for the frontend server
haproxy for load balancing to app servers, after nginx (better configurability than nginx’s balancing modules)
nagios for internal health checks
Pingdom for external service monitoring and paging
GeoIP for mapping IPs to locations

I use pingdom for myself....

As you notice, the first large sync takes some time because there is a lot of encryption that takes place.
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