I need to do a daily backup of a set of large files (>3GB each) that have a, maybe, 20 ΜΒ difference each day, mostly overwritten parts.
The problem is both the time needed to complete the daily backup but also bandwidth usage:
Our landline Internet is bad and goes off at times, an LTE backup kicks in but there's a monthly quota that gets easily eaten up with one or two backups leaving us severely throttled during work hours, if the landline goes off again.
I need a solution that can be run in the CLI/batch files and makes a differential backup, on Windows, without requiring cygwin. If I didn't have the cygwin limitation, rsync would be a prime candidate.