Heads up! This post was written 11 years ago. Some information might be outdated or may have changed since then.
I'm using Digital Ocean for my experiments and place to host some sites, they provide very good service for ridiculous price but SSD space is limited and for backup purposes I'm using cloud service providers like pCloud. Here are a sample command for backuping Mongo databases to pCloud service. 
cd /tmp/ && 
rm -rf mongo_dump && 
mkdir mongo_dump && 
mongodump --out /tmp/mongo_dump/ && 
tar -cvzf mongo_production_eureka.tar.gz mongo_dump/ && 
rm -r mongo_dump/ && 
curl -F "[email protected]" -F "password=password" -F "folderid=0" -F "filename=mongo1.tar.gz" -F "file=@/tmp/mongo_production_eureka.tar.gz" https://api.pcloud.com/uploadfile && 
rm mongo_production_eureka.tar.gz

For backup only: 
cd /tmp/ && \
rm -rf mongo_dump && \
mkdir mongo_dump && \
mongodump --out /tmp/mongo_dump/ && \
tar -cvzf mongo_production_eureka.tar.gz mongo_dump/ && \
rm -r mongo_dump/

Our sys admin helped me to make this variant as bash script: 
#!/bin/bash
set -e

dumpdir=mongodb.$$.$RANDOM
trap "rm -rf /tmp/$dumpdir /tmp/$dumpdir.tar.gz" exit SIGHUP SIGINT SIGTERM

cd /tmp
rm -rf $dumpdir
mkdir $dumpdir
mongodump --out /tmp/$dumpdir

tar czf $dumpdir.tar.gz mongo_dump/

curl -F "[email protected]" \
     -F "password=pas1" \
     -F "folderid=0" \
     -F "filename=mongo1.tar.gz" \
     -F "file=@/tmp/$dumpdir.tar.gz" \
     https://api.pcloud.com/uploadfile

More information about pCloud can be viewed in their website http://pcloud.com and Developer documentation
ps: pCloud have versioning of file and for that I'm using one name for all backups.

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