Engineering Notes & Research
The Sendense Blog
Plain-language engineering writing on backup, disaster recovery and cross-platform mobility — CloudStack, VMware exit planning, changed block tracking, immutability and provable recovery.
EBA Smart Transport: Reduce Backup Traffic on Claims-Enabled Paths
Backup traffic taxes cloud egress, tenant networks, firewalls and production apps. On claims-enabled transport modes, EBA Smart Transport can skip repository-held blocks before upload; RAW Block Sendense CBT uses full-source ingest.
VMware to CloudStack Migration: What Breaks and How to Plan for It
Drivers, network identity, storage conversion and stranded backup history — the real VMware to CloudStack migration pitfalls, and the plan that survives them.
The VMware Pricing Problem in 2026: Your Backup History Is the Hostage
Subscription-only licensing and bundled renewals are the visible cost. The real lock-in is years of restore points in a VMware-only format — and how to move them.
How to Back Up CloudStack: Host-Assisted CBT for QCOW2/NFS, ZFS, and Linstor/DRBD
CloudStack storage paths expose different change signals. Learn where qualified native or host-assisted paths apply and where backup uses a full-source-read EBA path.
What Is Changed Block Tracking (CBT)?
Changed block tracking records which disk blocks changed since the last backup, so incrementals read only those blocks. How CBT works on VMware and CloudStack/KVM.