High bandwidth usage from my backups

I have two of my VPSes which archive /var/www/ and a MySQL dump once a day, then I use another VPS to download them from the VPSes.

The backups together are about 500MB, and are downloaded once a day with SFTP so bandwidth usage should be ~15GB/mo?

But it's already used 50GB banwidth in 5 days.

One thing I noticed the other day, is that one one of the VPSes it pulls backups from, it had about 30+ SSH processes open and everything had crashed but that hasn't happened since.

Here's my backup script

sftp -P port backupuser@x.x.x.x:/*.7z backups/site1/;
sftp -P port backupuser@x.x.x.x:/*.7z backups/site2/;

and crontab is set to run it every 24 hours

http://ift.tt/1dvHQ0Z