I'm on AWS with my clients for a long time now but I'm going to need cut costs now to keep providing my services. On AWS I'm using RSync to keep some folders synchronized and DRDB to provide high availability with transparent failover having always an operacional and ready to use a mirror for each client machine.
Now I can't keep using DRBD because the much more cheaper cloud solution I'm migrating just provide for each machine an Ubuntu 14.04 LTS with just one partition and without LVM, this cloud platform also become a requirement for some clients of me.
The solution I'm thinking about is schedule shell scripts to daily BKP on one side, transfer it by SSH to another side and restore the BKP, it will become complex, error-prone and a will need a lot of work to develop and manage.
Many of my clients are just Wordpress+Mysql and accept a day of delay, I'm looking for alternatives to provide "high availability" even if it comes with a day of delay that don't force me to develop and manage scripts for each case with the restricted context.