VM Synchronization or similar to turnkeylinux Backup & Migration?

Question

Data synchronization

Hello colleagues. Until recently, I successfully used the TurnKey Backup & Migration service to synchronize a virtual machine on my home and work PCs, but the dollar is growing, data volumes are also increasing, which translates into small, but still not pleasant amounts.

I would like to know if there are free analogues?

The main requirement is simple:
I worked in the office, registered the command / pressed the button -> the virtual machine was synchronized. I came home, and the VM is already up to date.
And vice versa, I worked at home, came to the office, and everything was already updated there.

Answer 1

In fact, you pay not for the software that ensures the synchronization of your two virtual machines, but for the use of disk space on Amazon S3 (aws.amazon.com/en/s3/). The "free analogue" of S3 is Openstack SWIFT, which even a compatible API can do.
Only if you just need to synchronize files on 2 virtual machines, you don’t need anything like this “monstrous”, just use the rsync utility, which can do exactly what you need - synchronize the contents of files / directories. Or, if you are used directly to TurnKey Backup & Migration, it is an add-on for Duplicity, which can serve as a backend not only cloud storage, but also ssh / local file, etc.