Blog
Technical notes
What we learned running backups of archives with millions of files — costs, pitfalls and what to test before you need it.
· 8 min read
Cross-cloud bucket backup: the step-by-step and the traps
How to copy a bucket from OCI to AWS without scattering keys across files, with per-bucket permissions, and why the source credential needs write access on restore day.
· 8 min read
Multi-tenant: how to stop one customer's backup from leaking into another's
Application-layer validation fails on the path nobody reviewed. The isolation that survives a distracted team lives in the database, not in the code.
· 7 min read
What disappears from the bill of cheap storage
Price per gigabyte is the most visible line and almost never the largest one. Requests, egress, minimum retention and retrieval are what decide the real cost per TB over the long run.
· 7 min read
Why restore is the part nobody tests
A backup that finishes without errors doesn't prove recovery works. What to test, in what order, and how to run a rehearsal that fits in a single morning.
· 5 min read
Backup vs sync: the difference, and why sync is not a backup
Sync copies the mistake too. A file deleted or encrypted by ransomware disappears from both sides in seconds. How to tell whether you really have a backup.
· 5 min read
Who can open your backup
Every backup service answers this question. Most answer it buried in the terms of service. Ours is right here.
· 6 min read
We backed up 510,000 files and the database did not grow by a single row
A scale test with numbers, method and stated limits — including what would not work in your case.
· 5 min read
Why backing up millions of small files costs so much
The cost does not come from the space used. It comes from the number of operations — and the maths is easy to do before you spend anything.
· 5 min read
Glacier Deep Archive restore: 12 to 48 hours, and the other rules
The cheapest AWS storage class bills a 180-day minimum and 40 KB per object, and makes you wait hours to restore. What to check before you send backups there.
· 5 min read
Immutable backup with Object Lock: what actually protects you
Immutability only counts if an attacker who controls the account cannot undo it. The difference lives in configuration details.